The Atypical Thyroid Fine-Needle Aspiration: Past, Present, and Future
|
|
- Janice Charles
- 5 years ago
- Views:
Transcription
1 The Atypical Thyroid Fine-Needle Aspiration: Past, Present, and Future Massimo Bongiovanni, MD 1 ; Jeffrey F. Krane, MD, PhD 2 ; Edmund S. Cibas, MD 2 ; and William C. Faquin, MD, PhD 3 Thyroid fine-needle aspiration has developed into a key test in the evaluation of thyroid nodules. Although the interpretation of thyroid aspirates containing mild abnormalities is problematic, the introduction of the atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) category in The Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) has helped to delineate such cases in a systematic and clinically meaningful manner. Herein the authors review the cytomorphologic features associated with the AUS/FLUS interpretation and summarize the results of studies conducted since the implementation of TBSRTC. Cancer (Cancer Cytopathol) 2012;120: VC 2011 American Cancer Society. KEY WORDS: thyroid, fine-needle aspiration, atypia, atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS), Bethesda. Fine-needle aspiration (FNA) is the primary testing modality for identifying malignancy in patients with a thyroid nodule. A majority of thyroid FNA specimens, generally in the range of 60% to 70%, are classified as benign, and approximately 20% to 30% in total fall into the 3 categories of suspicious for a follicular neoplasm (SFN), suspicious for malignancy, and malignant. 1,2 The approximately 10% of cases remaining represent a small but significant subset of thyroid FNA specimens that exhibit some form of atypia of uncertain significance. 3 Such atypia most often results from a variety of benign cellular changes, but in some instances it reflects an underlying malignancy that has been suboptimally sampled or has subtle diagnostic features. Historically, the reporting of borderline atypia in thyroid aspirates was problematic. Diagnostic terms such as atypia and indeterminate had been used by different laboratories to mean different things, hindering communication and making comparison between studies difficult. 4-7 For example, the term indeterminate had been used to mean 1 or more of the following: atypical cells, not otherwise specified (NOS); a predominantly microfollicular lesion; follicular neoplasia; and atypical cells, rule out papillary thyroid carcinoma (PTC) Corresponding author: William C. Faquin, MD, PhD, Department of Pathology, Massachusetts General Hospital, Warren 219, 55 Fruit St, Boston, MA 02114; Fax: (617) ; wfaquin@partners.org 1 Institute of Pathology, Locarno, Switzerland; 2 Department of Pathology, Brigham and Women s Hospital, Boston, Massachusetts; 3 Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts Received: May 9, 2011; Revised: June 3, 2011; Accepted: June 6, 2011 Published online July 12, 2011 in Wiley Online Library (wileyonlinelibrary.com) DOI: /cncy.20178, wileyonlinelibrary.com Cancer Cytopathology April 25,
2 Definition of the Atypia of Undetermined Significance/Follicular Lesion of Undetermined Significance Category The recently introduced Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) 12 named and defined a specific category for borderline cases that do not fulfill the criteria for the other defined categories. TBSRTC offers a choice of 2 terms for this category: atypia of undetermined significance (AUS) and follicular lesion of undetermined significance (FLUS). The terms AUS and FLUS are synonymous because there was no consensus reached at the National Cancer Institute Thyroid Fine-Needle Aspiration State of the Science Conference regarding a single name for all categories, and laboratories are expected to choose the one they prefer for reporting thyroid FNA interpretations (Table 1). According to TBSRTC, the AUS/FLUS category is reserved for aspirates that contain follicular, lymphoid, or other cell types with architectural and/or nuclear atypia that is more pronounced than that observed in benign/reactive lesions yet not sufficient to be classified as SFN, suspicious for malignancy, or malignant. 3,12 General Considerations By definition, AUS/FLUS is a heterogeneous category that includes a variety of abnormal architectural, cellular, or nuclear features and, as such, implementation of this category among cytopathologists, at least initially, is expected to be variable. As with other diagnostic categories of uncertainty (such as atypical squamous cells of undetermined significance [ASCUS] for cervical cytology), AUS/FLUS has the potential to be overused. At the time of its implementation, the authors of the TBSRTC recommended that the AUS/FLUS category should not exceed 7% of thyroid FNA diagnoses. Based on available studies, the associated risk of malignancy for this category was anticipated to be in the range of 5% to 15%, intermediate between that of the benign and suspicious categories (Table 1) (Table 2). 7,15-22 In most instances, TBSRTC indicated that the initial follow-up of thyroid aspirates diagnosed as AUS/FLUS should be a repeat FNA (Table 1). In the majority of cases, a repeat FNA resolves the atypia into a more definitive diagnostic category. Table 1. Risk of Malignancy and Clinical Management for Each Category of TBSRTC Diagnostic Category AUS/FLUS Scenarios Risk of Malignancy (%) Usual Management I. Nondiagnostic or unsatisfactory 1-4 Repeat FNA with ultrasound guidance II. Benign 0-3 Clinical follow-up III. Atypia of undetermined 5-15 Repeat FNA significance or follicular lesion of undetermined significance IV. Follicular neoplasm or Surgical lobectomy suspicious for a follicular neoplasm V. Suspicious for malignancy Near-total thyroidectomy or surgical lobectomy VI. Malignant Near-total thyroidectomy Abbreviations: FNA, fine-needle aspiration; TBSRTC, The Bethesda System for Reporting Thyroid Cytopathology. Modified from Ali SZ, Cibas ES, eds. The Bethesda System for Reporting Thyroid Cytopathology: Definitions, Criteria and Explanatory Notes. New York: Springer; TBSRTC outlines a variety of scenarios for which the AUS/FLUS category is appropriate. 3 These scenarios are not comprehensive, but they do include the most common situations encountered in clinical practice that result in a diagnosis of AUS/FLUS. Definitions and examples are reviewed below. It is worth noting that, in many instances, a predisposing condition for an AUS/FLUS interpretation is a compromised specimen (eg, sparse cellularity, obscuring blood, or poor fixation). 3 Architectural atypia An abnormal arrangement of follicular cells with each other, so-called architectural atypia, can raise concern for a neoplasm under several different circumstances without being sufficiently convincing to warrant the interpretation of SFN. A subset of microfollicles is normal in a benign thyroid FNA specimen; many benign thyroid nodules demonstrate a mixture of macrofollicles and microfollicles, but usually with a predominantly macrofollicular cytoarchitectural pattern. However, a subset of thyroid FNA specimens are paucicellular and contain only a few well-formed microfollicles, trabeculae, or crowded groups (Figs. 1A-1C). Some of these cases may not even meet 74 Cancer Cytopathology April 25, 2012
3 Atypical Thyroid FNA/Bongiovanni et al Table 2. Post-TBSRTC Experience With AUS/FLUS Reference AUS/FLUS Rate, % Frequency of rfna After AUS/FLUS, % Persistent AUS/FLUS Cases in rfna, % Most Common Diagnosis in rfna (%) AUS/FLUS Cases With Histologic Follow-Up, % Malignancy Rate for AUS/FLUS (Analysis Restricted to Cases With Histologic Follow-Up), % Nayar & Ivanovic (total) 21 (total) 27 (total) Benign (58) (total) 46.5 total 6 (total) 15 a 19 a 31 a Benign (54 a ) 50 a 4 a 3 b 31 b 14 b Benign (71 b ) 30 b 2 b Theoharis c 6 Benign (65) 30.3 c 48 c Layfield NA NA NA Renshaw NA NA NA Ohori d 67 c Benign (84) c e Faquin & Baloch (MGH) Benign (62) 54 f 19 f 12 (HUP) Jo Nondiagnostic (62) Rabaglia NA NA NA VanderLaan Benign (48.4) g Abbreviations: AUS/FLUS, atypia of undetermined significance/follicular lesion of undetermined significance; HUP, Hospital of the University of Pennsylvania; MGH, Massachusetts General Hospital; NA, not available; rfna, repeat fine-needle aspiration; TBSRTC, The Bethesda System for Reporting Thyroid Cytopathology. a Considering morphologic indeterminate. b Considering adequacy-related indeterminate. c By patients. d Calculated in 100 patients. e Calculated in 117 FNAs. f Considering both initial and rfna AUS/FLUS. g Considering also cytologic follow-up. minimal adequacy criteria of TBSRTC (at least 6 groups of follicular cells with 10 cells per group), yet to interpret the aspirate as nondiagnostic would ignore the architectural atypia that is present. Another pattern of concerning architectural atypia occurs when only a subset of smears (such as a single slide from 1 pass) exhibits a predominance of microfollicles whereas other smears from the same case demonstrate a benign macrofollicular pattern. Still another instance of architectural atypia is subtle but persistent crowding of follicular cells throughout a paucicellular aspirate (Fig. 1D). Nuclear atypia Several patterns of nuclear atypia raise the specter of PTC but are quantitatively and/or qualitatively insufficient for an interpretation of suspicious for malignancy. These include a hypocellular aspirate (sometimes in the setting of extensive cystic degeneration) with only rare follicular cells exhibiting nuclear atypia suggestive of PTC (Fig. 2A). Alternatively, similar rare cells may be present in a cellular background that has an otherwise benign appearance, obscuring the significance of the rare atypical cells (Fig. 2B). In some instances, more diffuse but mild nuclear changes can be appreciated, with nuclear enlargement, crowding, and pallor, but without other supporting features (eg, intranuclear pseudoinclusions, grooves, and nuclear contour irregularities) of PTC (Fig. 2C). Focal and/or mild changes that suggest PTC are occasionally encountered in settings known to mimic the cytologic atypia of PTC, therefore raising doubt about the significance of the findings. Such confounding situations include patients with chronic lymphocytic thyroiditis (Hashimoto thyroiditis [HT]) (Fig. 2D) and those with a history of external beam radiation, radioiodine therapy (Fig. 2E), or thyroid suppressive agents, most notably for Graves disease. Oncocytic patterns of uncertain significance Some paucicellular thyroid aspirates are comprised of a virtually exclusive population of oncocytes (grouped or isolated) while lacking lymphocytes or significant numbers of benign, nononcocytic follicular Cancer Cytopathology April 25,
4 FIGURE 1. Atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) is shown demonstrating architectural atypia. (A) A hypocellular aspirate containing occasional microfollicular groups and blood is shown (smear, Papanicolaou stain). (B) Rare microfollicular (liquid-based preparation, Papanicolaou stain) and (C) trabecular groups admixed with blood (smear, Papanicolaou stain) are shown. (D) This hypocellular aspirate contains occasional groups of crowded follicular cells (smear, Papanicolaou stain). cells. The paucicellularity mitigates against the interpretation of SFN, Hurthle cell type (SFNHCT), but the exclusive or virtually exclusive population of Hurthle cells precludes an interpretation of benign (Figs. 3A and 3B). Aspirates with this pattern are better placed in the AUS/FLUS category, and patients may benefit from a repeat FNA performed within 3 to 6 months. 23,24 Another pattern is the cellular aspirate comprised exclusively or nearly exclusively of oncocytes in a patient with chronic lymphocytic thyroiditis (HT) (Fig. 3C) or multinodular hyperplasia (MNH). In both clinical situations, it is not unusual to find hyperplastic nodules comprised exclusively of Hurthle cells. If the aspirate is comprised exclusively or nearly exclusively of oncocytes and clinical data or ultrasound features suggest HT, either 76 Cancer Cytopathology April 25, 2012
5 Atypical Thyroid FNA/Bongiovanni et al FIGURE 2. Atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) is shown demonstrating nuclear atypia. (A) A hypocellular aspirate with a rare atypical follicular cell with intranuclear inclusion suggestive of papillary carcinoma is shown (smear, Papanicolaou stain). (B) A benign-appearing aspirate is shown containing abundant colloid, scattered follicular groups, and (arrow) a rare cluster of follicular cells with nuclear grooves and enlargement (inset) (smear, Papanicolaou stain). (C) Atypical follicular cells with nuclear enlargement, crowding, and pallor but without other supporting features of papillary carcinoma are shown (smear, Papanicolaou stain). (D) Follicular cells with mild nuclear atypia were noted, raising the possibility of papillary carcinoma in a background of chronic lymphocytic thyroiditis (smear, Papanicolaou stain). (E) Focal nuclear atypia including an intranuclear pseudoinclusion is shown in a patient who received prior radiotherapy FIGURE 2. for Hodgkin lymphoma (smear, Papanicolaou stain). SFNHCT or AUS/FLUS is an appropriate interpretation. If the pathologist chooses AUS/FLUS, the clinician is thereby informed that the differential diagnosis includes an oncocytic hyperplasia. Whereas an SFNHCT interpretation would prompt a reflex lobectomy, an interpretation of AUS/FLUS allows for clinical and radiologic correlation, with the possibility of conservative management by means of periodic thyroid examinations in selected circumstances. Roh et al recently demonstrated that the risk of malignancy in a patient with HT and an FNA specimen Cancer Cytopathology April 25,
6 comprised of a pure population of Hurthle cells falls halfway between the malignancy risks associated with benign and SFNHCT interpretations. 25 Classification of a cellular Hurthle cell aspirate in the setting of MNH is similarly flexible. TBSRTC provides for either using the AUS/ FLUS category or the SFNHCT category in this situation, based on the judgment of the cytopathologist. Clinical and radiologic correlation rather than repeat FNA are more likely to determine whether surgical intervention is appropriate in such cases. Atypia secondary to preparation artifact Preparation artifact alone is not sufficient to warrant the interpretation of AUS/FLUS. Nevertheless, some thyroid FNA specimens contain atypical cells that are hard to observe and assess confidently because of obscuring blood, poor clotting artifact, or poor fixation or staining (Figs. 4A-4C). Excessive blood and microclots can obscure the architectural pattern of follicular cells, in some instances making the groups appear falsely crowded or microfollicular. 11 When improperly fixed or stained slides are used, cells may appear larger than usual, especially at the periphery of the smear. Nuclei can appear enlarged, and the chromatin can resemble the salt-and-pepper pattern observed in medullary thyroid carcinoma. True atypical cells (with grooves and nuclear enlargement) can be admixed with such artifacts and lead to a false-positive interpretation. Similarly, if the stain is very pale, the chromatin pattern can raise the possibility of PTC. FIGURE 3. Atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) demonstrating oncocytic patterns of uncertain significance is shown. (A and B) In these 2 hypocellular aspirates, all the follicular cells had oncocytic features (smears; A, Giemsa stain; B, Papanicolaou stain). (C) An aspirate obtained from a patient with a history of Hashimoto thyroiditis was found to contain a pure population of Hurthle cells (smear, Papanicolaou stain). Atypical cyst-lining cells Atypical cyst-lining cells are a potential pitfall encountered with cystic thyroid nodules. 26 Benign cystlining cells exhibit a range of appearances from elongate, reactive-appearing cells to markedly enlarged cells with nuclear features that mimic PTC. Benign cyst-lining cells are typically polygonal or fusiform, with abundant dense cytoplasm; well-defined cellular borders; occasionally enlarged, grooved nuclei; and small, distinct nucleoli (Fig. 5A). In the context of a cystic aspirate with admixed macrofollicles and colloid, the benign cyst-lining cells are easily recognized as benign. However, in isolation, it can be difficult to exclude PTC. In the latter instance, the aspirate is better classified as AUS/FLUS to reflect the uncertainty regarding the findings (Figs. 5B-5D). 78 Cancer Cytopathology April 25, 2012
7 Atypical Thyroid FNA/Bongiovanni et al Other nuclear atypias In some situations, a minor population of follicular cells contain nuclei that are markedly enlarged with prominent nucleoli. Such focal atypical features can be observed in specimens from patients with a history of treatment with radioactive iodine (Figs. 6A and 6B), carbimazole, or other pharmaceutical agents, and can also be noted secondary to reparative changes associated with hemorrhage or cystic degeneration. 3,27,28 Knowledge of the clinical history can help to avoid overdiagnosis, but the atypia may be sufficiently marked that it warrants placing the diagnosis into the AUS/FLUS category. Lymphoid atypia In this scenario, the thyroid aspirate is comprised of a population of atypical lymphocytes (Fig. 7A) that nevertheless lack sufficient atypia to be interpreted as suspicious for malignancy. The lymphocytes may be small to intermediate in size, with mild nuclear atypia such as occasional cleaves or small nucleoli, as can be observed in some low-grade lymphoproliferative disorders (eg, extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue [MALT] type). Ideally, material for flow cytometry is available to help clarify the nature of the atypical lymphocytes, but for cases limited to microscopic evaluation alone, a diagnosis of AUS/FLUS is appropriate, with a recommendation for additional sampling for immunophenotyping. This scenario is in contrast to most cases of diffuse large B-cell lymphoma of the thyroid, which can readily be diagnosed as being suspicious for malignancy or malignant by FNA (Fig. 7B). FIGURE 4. Atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) demonstrating atypia secondary to preparation artifact is shown. Various artifacts such as (A) obscuring blood, (B) crush artifact, and (C) partial air-drying can make the evaluation of follicular groups difficult by introducing atypia of unknown significance (smears; A and C, Papanicolaou stain; B, Giemsa stain). Scenarios not otherwise specified The scenarios described above account for nearly all AUS/FLUS cases, but other, less common situations are encountered that are of uncertain diagnostic significance and warrant the AUS/FLUS designation. For example, the cytologist may encounter a population of atypical cells of uncertain origin (?follicular vs parafollicular,?mesenchymal vs epithelial,?primary tumor vs metastatic malignancy) (Figs. 8A and 8B). In the absence of available ancillary material to resolve this diagnostic uncertainty, an AUS/FLUS interpretation is appropriate. Cancer Cytopathology April 25,
8 FIGURE 5. Atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) demonstrating atypical cyst-lining cells is shown. (A) Elongate, reactive-appearing cyst-lining cells that were recognized as benign are shown. (B and C) Atypical follicular cells are shown in a cystic lesion exhibiting more atypia than usually noted in benign cyst-lining cells (smears, Papanicolaou stain). (D) Atypical cells in a cystic background representing histiocytes that do not express cytokeratin while rare follicular cells are positive (indicated in red) are shown (smear, cytokeratin immunostain). Post-Bethesda Studies One of the seminal accomplishments of TBSRTC is the introduction of a uniform terminology to facilitate the study of thyroid FNA specimens through improved communication and the reliable sharing of data among the cytology community. Because only a short interval of time has passed since the implementation of TBSRTC, published experience with AUS/FLUS is inevitably limited, and one must be wary of attempts to retrofit laboratory experiences to TBSRTC. With this caveat in mind, published experience with the AUS/FLUS category is reviewed below. AUS/FLUS use TBSRTC recommends that the rate of AUS/FLUS interpretations within a given laboratory not exceed 7%. It is important to note that this figure was intended as an initial guideline to encourage judicious use of the category and was not based on extensive clinical experience. The percentage of cases diagnosed as AUS/FLUS has been shown to vary widely. Although most published series demonstrate rates within the range of 7% to 12%, there is broad variation, with rates as low as 3% and as high as 20.5% (Table 2). Not surprisingly, those laboratories with higher AUS/FLUS rates typically report lower rates 80 Cancer Cytopathology April 25, 2012
9 Atypical Thyroid FNA/Bongiovanni et al that slightly higher rates, in the range of 7% to 12%, are likely to be more typical, at least in the early years of implementation of TBSRTC. In view of the various scenarios included in the AUS/FLUS diagnostic category, it is not surprising that there are significant interobserver and interinstitutional variabilities in making an AUS/FLUS diagnosis. Layfield et al, Ohori et al, Muddegowda et al, and Shi et al have reported low reproducibility for AUS/FLUS, with marked interobserver and intraobserver variations. 15,16,30,31 The level of experience of the clinician/pathologist performing the thyroid FNA, the methods used for specimen preparation and staining, the number of FNA passes performed, and the availability of onsite rapid interpretation may all be contributing factors to this variation. The publication of reference images and text for TBSRTC, both in print and on the Internet (available at: will inevitably promote greater uniformity. Other methods for improving performance have also been proposed. These include educational sessions using standardized and clear diagnostic criteria, 32 the use of representative case materials, 33 the use of consensus review with cytologicalhistological correlation, 34 and providing periodic individual feedback through quality assurance metrics. 35 These methods may reduce the rate of AUS/FLUS interpretations and the associated variability without compromising diagnostic performance. FIGURE 6. Atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) demonstrating other nuclear atypias is shown. (A and B) Aspirates from patients exposed to radiation or to certain pharmaceutical agents can exhibit enlarged follicular cell nuclei and prominent nucleoli (smears, Papanicolaou stain). of malignancy on follow-up. 16,17 These higher rates appear to be attributable in part to a relative over-representation of cases with poor cell preservation that might be better classified as benign or nondiagnostic. 16 Conversely, it has been suggested that extremely low rates of AUS are likely achieved at the expense of decreased sensitivity. 29 Overall, although the 7% target for AUS/FLUS may remain a reasonable goal, current experience suggests Clinical significance of the AUS/FLUS diagnosis The malignancy rate for the AUS/FLUS category was estimated to be between 5% and 15%. 12 Here, too, there has been wide variation in reported experience (Table 2). In studies that include cytologic follow-up, the rate of malignancy has usually been demonstrated to be within this low range, although the rate was reported to be 27.5% in 1 large study. 18 In the selected subset of patients undergoing surgery, the rate of malignancy is reported to vary between 6% and 48% (Table 2). Nevertheless, in the majority of laboratories, the average rate of malignancy for AUS/FLUS is intermediate between that of the benign category (0%-3%) and that of the SFN category (15%-30%). The most common malignant diagnosis made at the time of surgery in cases initially diagnosed as AUS/FLUS is PTC, usually of the follicular variant (PTC-FV). 15,19,36-38 PTC-FV is a challenging diagnosis, often exhibiting subtle nuclear features (both cytologically Cancer Cytopathology April 25,
10 oncocytic pattern of AUS as outlined and discussed earlier. This approach to managing patients with an AUS/ FLUS diagnosis is considered safe and cost-effective. 40,41 Correlation with clinical and radiologic features is also important, because patient management, although heavily influenced by the FNA interpretation, can and should be impacted by clinical and sonographic findings, and even the patient s own desires for treatment. In approximately 20% to 28% of AUS/FLUS cases, a repeat thyroid FNA will again be interpreted as AUS/FLUS (Table 2). 3,18,42 The risk of malignancy in this subset of patients has been reported to be higher by some 19 but not others, 17 and this approach has been called into question. 18 Furthermore, one of the assumptions underlying this approach is that a benign aspirate after a diagnosis of AUS/FLUS carries the same low risk of malignancy as an isolated benign aspirate, but the validity of this assumption has been challenged by some authors. 18,43 FIGURE 7. Atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) demonstrating lymphoid atypia is shown. (A) Thyroid fine-needle aspiration (FNA) specimens containing lymphocytes with mild nuclear atypia and obscuring blood and lacking immunophenotypic information were interpreted as AUS/FLUS with a recommendation for a repeat FNA to obtain material for ancillary studies. (B) A thyroid aspirate containing rare follicular cells and malignant-appearing large lymphocytes that would not be interpreted as AUS/FLUS is shown (smears, Papanicolaou stain). and histologically), with less-than-ideal reproducibility. 39 This likely accounts for at least some of the observed variability in malignancy rates. Initial management of AUS/FLUS cases Given the anticipated low rate of malignancy associated with an initial AUS/FLUS diagnosis, TBSRTC recommends that most patients undergo a repeat thyroid FNA within 3 to 6 months in an attempt to better define the nature of the atypia. 3,19,20,32 An exception is the pure Qualifiers of AUS As outlined above, it is clear that the AUS/FLUS category is a heterogeneous one. As such, it is to be expected that different patterns of AUS/FLUS may carry different risks of malignancy. Although qualifying AUS/ FLUS is not explicitly required by TBSRTC, some laboratories do so, in one way or another, and some authors have retrospectively reviewed cases in an attempt to correlate patterns with malignancy rates. Data have suggested that the presence of focal cytologic features of PTC confers a higher risk of malignancy than other AUS/FLUS patterns, 20,44 whereas architectural atypia alone is approximately half as likely to be malignant as other patterns and is more likely to be a follicular adenoma. 36 Among the challenges of an approach that uses qualifiers is the ability to reliably distinguish these patternsfromoneanotheraswellasothertbsrtccategories (eg, AUS/FLUS with cytologic atypia or focal features of PTC from the suspicious for malignancy category). Currently, further study of AUS/FLUS qualifiers for the purposes of refining criteria for this category and further stratifying the risk associated with different patterns has value much in the way that studying qualifiers of ASCUS helped to refine successive implementations of The Bethesda System for Reporting Cervical Cytology Cancer Cytopathology April 25, 2012
11 Atypical Thyroid FNA/Bongiovanni et al most associated with the categories are different (PTC for AUS/FLUS, follicular carcinoma for SFN), which may influence clinical decision-making regarding surgery. In addition, Shi et al and Yang et al have shown that if AUS cases are forced into either lower or higher diagnostic risk categories, the latter results in diminished sensitivity for detecting thyroid neoplasms, with increased false-negative and false-positive rates, making thyroid FNA a less effective screening test. 31,47 FIGURE 8. Atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) classified as not otherwise specified is shown. (A and B) These thyroid aspirates contained atypical cells of uncertain origin that in the absence of material for ancillary studies or clinical correlation could not be classified further (smears, Papanicolaou stain). Why use the AUS/FLUS category? The finding that the risk of malignancy associated with the AUS/FLUS category is intermediate between the benign and SFN categories supports the use of AUS/ FLUS as a separate and distinct category within TBSRTC (Table 1). Some authors have proposed that the risk of malignancy associated with AUS/FLUS sufficiently approximates the SFN category so that the use of a separate AUS/FLUS category is unnecessary. 37,46 However, the heterogeneity of AUS/FLUS may still result in greater refinement of this category, something that would be lost by grouping it with SFN. Furthermore, the malignancies Future Directions Although to our knowledge immunohistochemistry has only a very limited role in thyroid cytology, molecular testing using markers such as BRAF, RET/PTC, RAS, and paired box gene (PAX)/peroxisome proliferator-activated receptor-c (PPAR-c) shows more promise for wider applicability A BRAF mutation or RET/PTC gene rearrangement has very high specificity for PTC. When these molecular markers are positive in the AUS/FLUS category, the probability of a cancer outcome is very high. 16,55 However, a negative molecular result using the panel above is much less useful, in large part because many tumors, particularly PTC-FV, are negative for all of them or positive only for RAS mutations, which have much lower specificity and are noted in benign and malignant thyroid neoplasms. 56,57 A major obstacle to the application of a limited panel of molecular markers to thyroid FNA is the finding that currently available markers tend to work well with lesions that are readily diagnosed by cytomorphology; they are not as useful for the difficult thyroid FNA lesions diagnosed as AUS/FLUS, SFN, or suspicious for malignancy (PTC-FV). More recently, microarray data from > 200 genes have been used to produce a benign thyroid fingerprint that has the potential for use in guiding the management of patients with an AUS/FLUS interpretation. 58 Conclusions AUS/FLUS is comprised of a heterogeneous group of FNA patterns that are not clearly benign, suspicious, or malignant. Although the reproducibility of this interpretation is (fair? poor? fair-poor?), its use is warranted, but care must be exercised that it is used judiciously, and laboratories are encouraged to monitor the frequency with Cancer Cytopathology April 25,
12 which the interpretation is made. The recommended management of an initial AUS is a repeat FNA in most instances. As experience is gained with TBSRTC in general and AUS/FLUS in particular, it is expected that the criteria for AUS/FLUS as well its clinical management may be refined further. It is likely that molecular testing will one day play an important role in triaging patients with a diagnosis of AUS/FLUS. FUNDING SUPPORT No specific funding was disclosed. CONFLICT OF INTEREST DISCLOSURES Dr. Cibas is on the Steering Committee/Writing Group of Veracyte. REFERENCES 1. Gharib H, Goellner JR. Fine-needle aspiration biopsy of the thyroid: an appraisal. Ann Intern Med. 1993;118: Cibas ES, Ali SZ; NCI Thyroid FNA State of the Science Conference. The Bethesda System For Reporting Thyroid Cytopathology. Am J Clin Pathol. 2009;132: Krane JF, Nayar R, Renshaw AA. Atypical cells of undetermined significance. In: Ali SZ, Cibas ES, eds. The Bethesda System for Reporting Thyroid Cytopathology: Definitions, Criteria and Explanatory Notes. New York: Springer; 2010: Redman R, Yoder BJ, Massoll NA. Perceptions of diagnostic terminology and cytopathologic reporting of fine-needle aspiration biopsies of thyroid nodules: a survey of clinicians and pathologists. Thyroid. 2006;16: Yoder BJ, Redman R, Massoll NA. Validation of a five-tier cytodiagnostic system for thyroid fine needle aspiration biopsies using cytohistologic correlation. Thyroid. 2006;16: Poller DN, Ibrahim AK, Cummings MH, Mikel JJ, Boote D, Perry M. Fine-needle aspiration of the thyroid. Cancer. 2000;90: Rabaglia JL, Kabbani W, Wallace L, et al. Effect of the Bethesda system for reporting thyroid cytopathology on thyroidectomy rates and malignancy risk in cytologically indeterminate lesions. Surgery. 2010;148: ; discussion Pang T, Ihre-Lundgren C, Gill A, et al. Correlation between indeterminate aspiration cytology and final histopathology of thyroid neoplasms. Surgery. 2010;148: Marhefka GD, McDivitt JD, Shakir KM, Drake AJ 3rd. Diagnosis of follicular neoplasm in thyroid nodules by fine needle aspiration cytology: does the result, benign vs. suspicious for a malignant process, in these nodules make a difference? Acta Cytol. 2009;53: Miller B, Burkey S, Lindberg G, Snyder WH 3rd, Nwariaku FE. Prevalence of malignancy within cytologically indeterminate thyroid nodules. Am J Surg. 2004; 188: Abele JS, Levine RA. Diagnostic criteria and risk-adapted approach to indeterminate thyroid cytodiagnosis. Cancer (Cancer Cytopathol). 2010;118: Ali SZ, Cibas ES, eds. The Bethesda System for Reporting Thyroid Cytopathology: Definitions, Criteria and Explanatory Notes. New York: Springer; Lewis CM, Chang KP, Pitman M, Faquin WC, Randolph GW. Thyroid fine-needle aspiration biopsy: variability in reporting. Thyroid. 2009;19: Baloch ZW, LiVolsi VA, Asa SL, et al. Diagnostic terminology and morphologic criteria for cytologic diagnosis of thyroid lesions: a synopsis of the National Cancer Institute Thyroid Fine-Needle Aspiration State of the Science Conference. Diagn Cytopathol. 2008;36: Layfield LJ, Morton MJ, Cramer HM, Hirschowitz S. Implications of the proposed thyroid fine-needle aspiration category of follicular lesion of undetermined significance : a five-year multi-institutional analysis. Diagn Cytopathol. 2009;37: Ohori NP, Nikiforova MN, Schoedel KE, et al. Contribution of molecular testing to thyroid fine-needle aspiration cytology of follicular lesion of undetermined significance/ atypia of undetermined significance. Cancer (Cancer Cytopathol). 2010;118: Nayar R, Ivanovic M. The indeterminate thyroid fine-needle aspiration: experience from an academic center using terminology similar to that proposed in the 2007 National Cancer Institute Thyroid Fine Needle Aspiration State of the Science Conference. Cancer (Cancer Cytopathol). 2009;117: VanderLaan PA, Marqusee E, Krane JF. Clinical outcome for atypia of undetermined significance in thyroid fine-needle aspirations: should repeated fna be the preferred initial approach? Am J Clin Pathol. 2011;135: Faquin WC, Baloch ZW. Fine-needle aspiration of follicular patterned lesions of the thyroid: diagnosis, management, and follow-up according to National Cancer Institute (NCI) recommendations. Diagn Cytopathol. 2010;38: Renshaw AA. Should atypical follicular cells in thyroid fine-needle aspirates be subclassified? Cancer (Cancer Cytopathol). 2010;118: Theoharis CG, Schofield KM, Hammers L, Udelsman R, Chhieng DC. The Bethesda thyroid fine-needle aspiration classification system: year 1 at an academic institution. Thyroid. 2009;19: Jo VY, Stelow EB, Dustin SM, Hanley KZ. Malignancy risk for fine-needle aspiration of thyroid lesions according to the Bethesda System for Reporting Thyroid Cytopathology. Am J Clin Pathol. 2010;134: Cancer Cytopathology April 25, 2012
13 Atypical Thyroid FNA/Bongiovanni et al 23. Giorgadze T, Rossi ED, Fadda G, Gupta PK, Livolsi VA, Baloch Z. Does the fine-needle aspiration diagnosis of Hurthle-cell neoplasm/follicular neoplasm with oncocytic features denote increased risk of malignancy? Diagn Cytopathol. 2004;31: Pu RT, Yang J, Wasserman PG, Bhuiya T, Griffith KA, Michael CW. Does Hurthle cell lesion/neoplasm predict malignancy more than follicular lesion/neoplasm on thyroid fine-needle aspiration? Diagn Cytopathol. 2006;34: Roh MH, Jo VY, Stelow EB, et al. The predictive value of the fine-needle aspiration diagnosis suspicious for a follicular neoplasm, hurthle cell type in patients with hashimoto thyroiditis. Am J Clin Pathol. 2011;135: Faquin WC, Cibas ES, Renshaw AA. Atypical cells in fine-needle aspiration biopsy specimens of benign thyroid cysts. Cancer (Cancer Cytopathol). 2005;105: Granter SR, Cibas ES. Cytologic findings in thyroid nodules after 131I treatment of hyperthyroidism. Am J Clin Pathol. 1997;107: Smejkal V, Smejkalova E, Rosa M, Zeman V, Smetana K. Cytologic changes simulating malignancy in thyrotoxic goiters treated with carbimazole. Acta Cytol. 1985;29: Renshaw AA. Subclassification of atypical cells of undetermined significance in direct smears of fine-needle aspirations of the thyroid: distinct patterns and associated risk of malignancy [published online ahead of print March 25, 2011]. Cancer (Cancer Cytopathol). doi: /cncy Muddegowda PH, Lingegowda J, Natesan R, Kurpad R. Divide and rule: cytodiagnosis of thyroid lesions using pattern analysis: a study of 233 cases [published online ahead of print November 9, 2010]. Diagn Cytopathol. 31. Shi Y, Ding X, Klein M, et al. Thyroid fine-needle aspiration with atypia of undetermined significance: a necessary or optional category? Cancer (Cancer Cytopathol). 2009; 117: Jing X, Roh MH, Knoepp SM, Zhao L, Michael CW. Minimizing the diagnosis of follicular lesion of undetermined significance and identifying predictive features for neoplasia [published online ahead of print October 14, 2010]. Diagn Cytopathol. 33. Mahajan A, Kasper K, Lin X, et al. Thyroid FNA atypia of undetermined significance (AUS): variability in pathologist reporting and clinical follow-up. Mod Pathol. 2011;24(1 suppl):98a. 34. Jing X, Knoepp SM, Roh MH, et al. Consensual review minimizes the diagnosis of follicular lesion of undetermined significance and improves reproducibility and cyto-histologic concordance. Mod Pathol. 2011;24(1 suppl):94a. 35. VanderLaan PA, Krane JK, Cibas ES. Atypia of undetermined significance in thyroid fine-needle aspiration: characterizing cytopathologist practice patterns. Mod Pathol. 2011;24(1 suppl):108a. 36. VanderLaan PA, Marqusee E, Krane JF. Utility of diagnostic qualifiers for thyroid fine-needle aspirations with atypia of undetermined significance. Am J Clin Pathol. In press. 37. MarchevskyAM,WaltsAE,BoseS,etal.Evidence-basedevaluation of the risks of malignancy predicted by thyroid fine-needle aspiration biopsies. Diagn Cytopathol. 2010;38: Wu S, Demay RM, Papas P, Yan B, Reeves W. Follicular lesions of the thyroid: a retrospective study of 1,348 fine needle aspiration biopsies [published online ahead of print October 17, 2010]. Diagn Cytopathol. 39. Elsheikh TM, Asa SL, Chan JK, et al. Interobserver and intraobserver variation among experts in the diagnosis of thyroid follicular lesions with borderline nuclear features of papillary carcinoma. Am J Clin Pathol. 2008;130: Yassa L, Cibas ES, Benson CB, et al. Long-term assessment of a multidisciplinary approach to thyroid nodule diagnostic evaluation. Cancer (Cancer Cytopathol). 2007;111: Baloch Z, LiVolsi VA, Jain P, et al. Role of repeat fine-needle aspiration biopsy (FNAB) in the management of thyroid nodules. Diagn Cytopathol. 2003;29: Faquin WC. Diagnosis and reporting of follicular-patterned thyroid lesions by fine needle aspiration. Head Neck Pathol. 2009;3: Renshaw AA. Does a repeated benign aspirate change the risk of malignancy after an initial atypical thyroid fine-needle aspiration? Am J Clin Pathol. 2010;134: Weber D, Brainard J, Chen L. Atypical epithelial cells, cannot exclude papillary carcinoma, in fine needle aspiration of the thyroid. Acta Cytol. 2008;52: Solomon D, Nayar R. The Bethesda System for Reporting Cervical Cytology. 2nd ed. New York: Springer-Verlag; Somma J, Schlecht NF, Fink D, Khader SN, Smith RV, Cajigas A. Thyroid fine needle aspiration cytology: follicular lesions and the gray zone. Acta Cytol. 2010;54: Yang J, Schnadig V, Logrono R, Wasserman PG. Fine-needle aspiration of thyroid nodules: a study of 4703 patients with histologic and clinical correlations. Cancer (Cancer Cytopathol). 2007;111: Bartolazzi A, Orlandi F, Saggiorato E, et al. Galectin-3- expression analysis in the surgical selection of follicular thyroid nodules with indeterminate fine-needle aspiration cytology: a prospective multicentre study. Lancet Oncol. 2008;9: Mills LJ, Poller DN, Yiangou C. Galectin-3 is not useful in thyroid FNA. Cytopathology. 2005;16: Kato MA, Fahey TJ 3rd. Molecular markers in thyroid cancer diagnostics. Surg Clin North Am. 2009;89: Cantara S, Capezzone M, Marchisotta S, et al. Impact of proto-oncogene mutation detection in cytological specimens from thyroid nodules improves the diagnostic accuracy of cytology. J Clin Endocrinol Metab. 2010; 95: Mathur A, Weng J, Moses W, et al. A prospective study evaluating the accuracy of using combined clinical factors and candidate diagnostic markers to refine the accuracy of thyroid fine needle aspiration biopsy. Surgery. 2010;148: ; discussion Cancer Cytopathology April 25,
14 53. Melillo RM, Santoro M, Vecchio G. Differential diagnosis of thyroid nodules using fine-needle aspiration cytology and oncogene mutation screening: are we ready? F1000 Med Rep. 2010;2: Nikiforov YE, Steward DL, Robinson-Smith TM, et al. Molecular testing for mutations in improving the fine-needle aspiration diagnosis of thyroid nodules. J Clin Endocrinol Metab. 2009;94: Nikiforova MN, Nikiforov YE. Molecular diagnostics and predictors in thyroid cancer. Thyroid. 2009;19: Rivera M, Ricarte-Filho J, Knauf J, et al. Molecular genotyping of papillary thyroid carcinoma follicular variant according to its histological subtypes (encapsulated vs infiltrative) reveals distinct BRAF and RAS mutation patterns. Mod Pathol. 2010;23: Zhu Z, Gandhi M, Nikiforova MN, Fischer AH, Nikiforov YE. Molecular profile and clinical-pathologic features of the follicular variant of papillary thyroid carcinoma. An unusually high prevalence of ras mutations. Am J Clin Pathol. 2003;120: Haugen BR, Baloch ZW, Chudova D, et al. Development of a novel molecular classifier to accurately identify benign thyroid nodules in patients with indeterminate FNA cytology. Presented at the 14th International Thyroid Congress; September 11-16, 2010; Paris, France. 86 Cancer Cytopathology April 25, 2012
DIAGNOSIS AND REPORTING OF FOLLICULAR-PATTERNED THYROID LESIONS BY FINE NEEDLE ASPIRATION
Follicular-patterned thyroid lesions, WC Faquin 1 DIAGNOSIS AND REPORTING OF FOLLICULAR-PATTERNED THYROID LESIONS BY FINE NEEDLE ASPIRATION William C. Faquin, M.D., Ph.D Department of Pathology, Massachusetts
More informationUsefulness of Diagnostic Qualifiers for Thyroid Fine-Needle Aspirations With Atypia of Undetermined Significance
Anatomic Pathology / AUS Qualifiers in Thyroid FNAs Usefulness of Diagnostic Qualifiers for Thyroid Fine-Needle Aspirations With Atypia of Undetermined Significance Paul A. VanderLaan, MD, PhD, 1 Ellen
More informationClinical Outcome for Atypia of Undetermined Significance in Thyroid Fine-Needle Aspirations Should Repeated FNA Be the Preferred Initial Approach?
Anatomic Pathology / Clinical Outcome for AUS Thyroid FNA Clinical Outcome for Atypia of Undetermined Significance in Thyroid Fine-Needle Aspirations Should Repeated FNA Be the Preferred Initial Approach?
More informationBackground to the Thyroid Nodule
William C. Faquin, MD, PhD Professor of Pathology Harvard Medical School Director of Head and Neck Pathology Massachusetts Eye and Ear Massachusetts General Hospital THYROID FNA: PART I Background to the
More informationCase #1. Ed Stelow, MD University of Virginia
Case #1 Ed Stelow, MD University of Virginia Imagine, If You Will It s 4:30 on Friday Last cytology case A thyroid FNA from outside that did not have any onsite interpretation It is from a 45-year old
More informationThyroid Cytopathology: Weighing In The Bethesda System
Thyroid Cytopathology: Weighing In The Bethesda System V8 Conflicts No financial consideration Bias Work in the Canadian environment where litigation is less Thyroid cytology is often referred in by small
More informationPredictors of Malignancy in Thyroid Fine-Needle Aspirates Cyst Fluid Only Cases
Predictors of Malignancy in Thyroid Fine-Needle Aspirates Cyst Fluid Only Cases Can Potential Clues of Malignancy Be Identified? Mohammad Jaragh, MD 1 ; V. Bessie Carydis, MMedSci (Cytol) 1 ; Christina
More informationPotential Pitfalls for False Suspicion of Papillary Thyroid Carcinoma:
SUPPLEMENT 1 SPECIAL ISSUE: CYTOPATHOLOGY OF THE THYROID GLAND Guest Editor: Zubair Baloch Potential Pitfalls for False Suspicion of Papillary Thyroid Carcinoma: A Cytohistologic Review of 22 Cases Xin
More informationsystem and the Bethesda system applied for reporting thyroid cytopathology
Original Research Article A comparative study between conventional system and the Bethesda system applied for reporting thyroid cytopathology M. Mamatha 1*, S. Chandra Sekhar 2, H. Sandhya Rani 3, S. Sandhya
More informationTBSRTC 1- Probabilistic approach and Relationship to Clinical Algorithms
The Benefits of a Uniform Reporting System for Thyroid Cytopathology BETHESDA REPORTING SYSTEM Prof. Fernando Schmitt Department of Pathology and Oncology, Medical Faculty of Porto University Head of Molecular
More informationUpdate in Thyroid Fine Needle Aspiration
Endocr Pathol (2011) 22:178 183 DOI 10.1007/s12022-011-9182-7 Update in Thyroid Fine Needle Aspiration William C. Faquin & Massimo Bongiovanni & Peter M. Sadow Published online: 14 October 2011 # Springer
More informationCytopathological evaluation of various thyroid lesions based on Bethesda system for reporting thyroid lesions
International Journal of Research in Medical Sciences Khadatkar AS et al. Int J Res Med Sci. 2017 Apr;5(4):1339-1343 www.msjonline.org pissn 2320-6071 eissn 2320-6012 Original Research Article DOI: http://dx.doi.org/10.18203/2320-6012.ijrms20170901
More informationThyroid Nodules: Understanding FNA Cytology (The Bethesda System for Reporting of Thyroid Cytopathology) Shamlal Mangray, MB, BS
Thyroid Nodules: Understanding FNA Cytology (The Bethesda System for Reporting of Thyroid Cytopathology) Shamlal Mangray, MB, BS Attending Pathologist Rhode Island Hospital, Providence, RI DISCLOSURE:
More informationNCI Thyroid FNA State of the Science Conference. The Bethesda System For Reporting Thyroid Cytopathology
The Bethesda System For Reporting Thyroid Cytopathology Towards a Uniform Terminology With Management Guidelines NCI Thyroid FNA State of the Science Conference Bethesda, MD October 22-23, 2007 154 registrants
More informationFNA of Thyroid. Toward a Uniform Terminology With Management Guidelines. NCI NCI Thyroid FNA State of the Science Conference
FNA of Thyroid NCI NCI Thyroid FNA State of the Science Conference Toward a Uniform Terminology With Management Guidelines Thyroid Thyroid FNA Cytomorphology NCI Thyroid FNA State of the Science Conference
More informationKyle C. Strickland, MD, PhD; Brooke E. Howitt, MD; Justine A. Barletta, MD; Edmund S. Cibas, MD Jeffrey F. Krane, MD, PhD
Suggesting the Cytologic Diagnosis of Noninvasive Follicular Thyroid Neoplasm With Papillary-Like Nuclear Features (NIFTP): A Retrospective Analysis of Atypical and Suspicious Nodules Kyle C. Strickland,
More informationUpdate on Thyroid FNA The Bethesda System. Shikha Bose M.D. Associate Professor Cedars Sinai Medical Center
Update on Thyroid FNA The Bethesda System Shikha Bose M.D. Associate Professor Cedars Sinai Medical Center Thyroid Nodules Frequent occurrence Palpable: 4-7% of adults Ultrasound: 10-31% Majority benign
More informationBuilding On The Best A Review and Update on Bethesda Thyroid 2017
Building On The Best A Review and Update on Bethesda Thyroid 2017 Syed Z. Ali, MD, FRCPath, FIAC Professor of Pathology and Radiology The Johns Hopkins Hospital, Baltimore, Maryland USA TBSRTC Diagnostic
More informationTHYROID CYTOLOGY THYROID CYTOLOGY FINE-NEEDLE-ASPIRATION ANCILLARY TESTS IN THYROID FNA
ANCILLARY TESTS IN THYROID FNA Prof. Fernando Schmitt Department of Pathology and Oncology, Medical Faculty of Porto University Head of Molecular Pathology Unit, IPATIMUP General-Secretary of the International
More information3/22/2017. Disclosure of Relevant Financial Relationships. Cytomorphologic Thresholds for Classifying Thyroid FNAs as Suspicious and Positive for PTC
Cytomorphologic Thresholds for Classifying Thyroid FNAs as Suspicious and Positive for PTC Tarik M. Elsheikh, MD Professor and Medical Director Anatomic Pathology Cleveland Clinic Laboratories Disclosure
More informationCytology for the Endocrinologist. Nicole Massoll M.D
Cytology for the Endocrinologist Nicole Massoll M.D Objectives Discuss slide preperation Definitions of adequacy ROSE (Rapid On-Site Evaluation) Thyroid Cytology Adequacy Nicole Massoll M.D. University
More informationThe Bethesda System for Reporting Thyroid Cytopathology, Laila Khazai 11/4/17
The Bethesda System for Reporting Thyroid Cytopathology, 2017 Laila Khazai 11/4/17 In Summary No major changes for cytologists. The clinical team is faced with different risk of malignancies (ROM) associated
More informationInternational Journal of Health Sciences and Research ISSN:
International Journal of Health Sciences and Research www.ijhsr.org ISSN: 2249-9571 Original Research Article Validity Assessment of The Bethesda System for Reporting Thyroid Cytopathology Ranjana Solanki
More informationThe Indeterminate Thyroid Fine-Needle Aspiration
The Indeterminate Thyroid Fine-Needle Aspiration Experience From an Academic Center Using Terminology Similar to That Proposed in the 2007 National Cancer Institute Thyroid Fine Needle Aspiration State
More informationCytomorphologic Thresholds for Classifying Thyroid FNAs as Suspicious and Positive for PTC
Cytomorphologic Thresholds for Classifying Thyroid FNAs as Suspicious and Positive for PTC Tarik M. Elsheikh, MD Professor and Medical Director Anatomic Pathology Cleveland Clinic Laboratories Case Study
More informationASC Companion Meeting at the 2017 USCAP: Ancillary Molecular Testing in "Indeterminate. Thyroid Nodules: How Far Have We Come?
ASC Companion Meeting at the 2017 USCAP: Ancillary Molecular Testing in "Indeterminate Thyroid Nodules: How Far Have We Come? William C. Faquin, MD, PhD, Massachusetts General Hospital, Boston, MA The
More information"Atypical": Criteria and
"Atypical": Criteria and Controversies Esther Rossi MD PhD MIAC Division of Anatomic Pathology and Cytology Catholic University of Sacred Heart Rome, Italy CASE HISTORY In 2015, 45 y/o woman underwent
More informationJournal of Diagnostic Pathology 2011 (6); 1: Leading Article
Leading Article Beyond the horizon of current thyroid cytology reporting in Sri Lanka... Lokuhetty MDS Thyroid enlargement is a commonly encountered clinical problem among Sri Lankan patients, be it diffuse
More informationThyroid master class. Thyroid Fine needle aspiration cytology and liquid-based techniques: Hologic and Becton Dickinson
Thyroid master class Thyroid Fine needle aspiration cytology and liquid-based techniques: Hologic and Becton Dickinson Principle of LBC Collection of cells in liquid medium Immediate fixation Processor-prepared
More informationINTRODUCTION. Original Article. Jiyeon Hyeon, MD 1 ; Soomin Ahn, MD 1 ; Jung Hee Shin, MD, PhD 2 ; and Young Lyun Oh, MD, PhD 1
The Prediction of Malignant Risk in the Category Atypia of Undetermined Significance/Follicular Lesion of Undetermined Significance of the Bethesda System for Reporting Thyroid Cytopathology Using Subcategorization
More informationCytological Evaluation of Thyroid Lesions Based on the Bethesda System.
IOSR Journal of Dental and Medical Sciences (IOSR-JDMS) e-issn: 2279-0853, p-issn: 2279-086.Volume 5, Issue 2 Ver. VII (December. 206), PP 2-7 www.iosrjournals.org Cytological Evaluation of Thyroid Lesions
More informationA Cytohistological Correlation in Thyroid Swelling with Special Reference to The Bethesda System: A Study of 192 Cases.
IOSR Journal of Dental and Medical Sciences (IOSR-JDMS) e-issn: 2279-0853, p-issn: 2279-0861.Volume 16, Issue 10 Ver. XI (Oct. 2017), PP 55-59 www.iosrjournals.org A Cytohistological Correlation in Thyroid
More informationCN 925/15 History. Microscopic Findings
CN 925/15 History 78 year old female. FNA indeterminate lesion right thyroid lobe. Previous THY1C (UK) Bethesda category 1 cyst fluid. Ultrasound showed part solid/cystic changes, indeterminate in nature
More informationThe Bethesda system for reporting thyroid cytopathology: Should Sri Lanka adopt it?
The Bethesda system for reporting thyroid cytopathology: Should Sri Lanka adopt it? Professor. Chandu de Silva Chair and Senior Professor of Pathology Department of Pathology, Faculty of Medicine, University
More informationThyroid FNA: Diagnosis, Challenges and Solutions. Disclosures
Thyroid FNA: Diagnosis, Challenges and Solutions Zubair W. Baloch, MD, PhD None Disclosures 1 Questions to Myself? Where We are Now? The Present 2 Reality Check There is More to How Thyroid Nodules are
More informationThyroid follicular neoplasms in cytology. Ulrika Klopčič Institute of Oncology, Department of Cytopathology, Ljubljana, Slovenia
Thyroid follicular neoplasms in cytology Ulrika Klopčič Institute of Oncology, Department of Cytopathology, Ljubljana, Slovenia Lecture overview importance of FNAB in assessing thyroid lesions follicular
More informationTHE BETHESDA SYSTEM FOR REPORTING THYROID CYTOPATHOLOGY: A TWO YEAR INSTITUTIONAL AUDIT
IJCRR Section: Healthcare Sci. Journal Impact Factor 4.016 Research Article THE BETHESDA SYSTEM FOR REPORTING THYROID CYTOPATHOLOGY: A TWO YEAR INSTITUTIONAL AUDIT Salma Bhat 1, Nazia Bhat 1, Humaira Bashir
More informationHow to Interpret Thyroid Fine-Needle Aspiration Biopsy Reports: A Guide for the Busy Radiologist in the Era of the Bethesda Classification System
Neuroradiology/Head and Neck Imaging Review Dhyani et al. How to Interpret FNAB Results of Thyroid Nodules Neuroradiology/Head and Neck Imaging Review Manish Dhyani 1 William Faquin 2 Carrie C. Lubitz
More informationVolume 2 Issue ISSN
Volume 2 Issue 3 2012 ISSN 2250-0359 Correlation of fine needle aspiration and final histopathology in thyroid disease: a series of 702 patients managed in an endocrine surgical unit *Chandrasekaran Maharajan
More informationXIII CONGRESSO NAZIONALE Roma, 7-9 novembre NODULO TIROIDEO: Agoaspirato o Core Needle Biopsy?
XIII CONGRESSO NAZIONALE NODULO TIROIDEO: Agoaspirato o Core Needle Biopsy? Anna Crescenzi Policlinico Universitario Campus Bio-Medico Roma Indeterminate lesions are heterogeneous The gray zone CONSERVATIVE
More informationCase #1 FNA of nodule in left lobe of thyroid in 67 y.o. woman
Challenging Cases Manon Auger M.D., F.R.C.P. (C) Professor, Department of Pathology McGill University Director, Cytopathology Laboratory McGill University it Health Center Case #1 FNA of nodule in left
More informationUltrasound-Guided Fine-Needle Aspiration of Thyroid Nodules: New events
Ultrasound-Guided Fine-Needle Aspiration of Thyroid Nodules: New events Sandrine Rorive, M.D., PhD. Erasme Hospital - Université Libre de Bruxelles (ULB) INTRODUCTION The assessment of thyroid nodules
More informationClinical Study Diagnosis of Follicular Lesions of Undetermined Significance in Fine-Needle Aspirations of Thyroid Nodules
Thyroid Research Volume 2013, Article ID 250347, 6 pages http://dx.doi.org/10.1155/2013/250347 Clinical Study Diagnosis of Follicular Lesions of Undetermined Significance in Fine-Needle Aspirations of
More informationIntroduction 10/27/2011. Follicular Lesion/Atypia of Undetermined Significance
Follicular Lesion/Atypia of Undetermined Significance Tarik M. Elsheikh, MD Cleveland Clinic Cleveland, Ohio Diagnostic Categories Proposed by Bethesda System/NCI Thyroid Conference 1. Benign 2. Follicular
More informationACCME/Disclosures. Questions to Myself? 4/11/2016
The New Diagnostic Paradigms in Thyroid Surgical Pathology and Affects on Reporting of Thyroid Fine-Needle Aspiration Specimens Deliberations, Criticisms & Discussions Zubair W. Baloch, MD, PhD. Professor
More informationNIFTP Cytologic Aspects
NIFTP Cytologic Aspects William C. Faquin, MD PhD Director, Head and Neck Pathology Massachusetts General Hospital & Massachusetts Eye and Ear Infirmary Boston, MA USA So, what is the story about FVPTC
More informationASCP Competency Assessment
ASCP Competency Assessment Thyroid Cytopathology Ricardo R. Lastra, MD Michelle R. Pramick, MD Zubair W. Baloch, MD, PhD Department of Pathology & Laboratory Medicine University of Pennsylvania, Perelman
More informationCLINICAL MEDICAL POLICY
Policy Name: Policy Number: Responsible Department(s): CLINICAL MEDICAL POLICY Molecular Markers for Fine Needle Aspirates of Thyroid Nodules MP-065-MD-DE Medical Management Provider Notice Date: 10/15/2018;
More informationRates of thyroid malignancy by FNA diagnostic category
Williams et al. Journal of Otolaryngology - Head and Neck Surgery 2013, 42:61 ORIGINAL RESEARCH ARTICLE Open Access Rates of thyroid malignancy by diagnostic category Blair A Williams 1*, Martin J Bullock
More informationThe Korean Journal of Cytopathology 15(1) : 60-64, 2004
15 1 The Korean Journal of Cytopathology 15(1) : 60-64, 2004 : INTRODUCTION Papillary carcinoma of the thyroid gland has for long been traditionally diagnosed on the basis of the characteristic papillary
More informationDOWNLOAD ENTIRE DOCUMENT FROM
PREVIEW ONLY 1 Atlas on Bethesda system for reporting Thyroid Cytology PREVIEW ONLY 2 OVERVIEW 1. Indications and goal of thyroid FNA 2. Contraindications 3. Procurement of cell sample 4. Staining methods
More informationLet s Make Sense of Present & Predict Future. In Light of Past 1/12/2016
The New Diagnostic Paradigms in Thyroid Surgical Pathology and Affects on Reporting of Thyroid Fine Needle Aspiration Specimens Deliberations, Criticisms & Discussions Zubair W. Baloch, MD, PhD. Professor
More informationHEAD AND NECK ENDOCRINE SURGERY
HEAD AND NECK ENDOCRINE SURGERY OCTOBER 22-23, 2010 THE MARK HOPKINS SAN FRANCISCO, CA THYROID FNA AND CYTOPATHOLOGY THEODORE R. MILLER, MD THE THYROID NODULE Prevalence of palpable nodule: Female ~ 6%
More informationInter-observer reproducibility using The Besthesda System for Reporting Thyroid Cytopathology (TBSRTC)
SHORT COMMUNICATION Inter-observer reproducibility in thyroid cytology reporting Inter-observer reproducibility using The Besthesda System for Reporting Thyroid Cytopathology (TBSRTC) Doshi Neena 1*, Jhabuawala
More informationDepartment of Surgery, Gachon University Gil Hospital, Gachon University of Medicine and Science, Incheon, Departments of
J Korean Surg Soc 2011;81:75-84 DOI: 10.4174/jkss.2011.81.2.75 ORIGINAL ARTICLE JKSS Journal of the Korean Surgical Society pissn 2233-7903 ㆍ eissn 2093-0488 Review of atypical cytology of thyroid nodule
More informationFine Needle Aspiration Cytology of Thyroid Follicular Neoplasm: Cytohistologic Correlation and Accuracy
The Korean Journal of Pathology 2013; 47: 61-66 ORIGINAL ARTICLE Fine Needle Aspiration Cytology of Thyroid Follicular Neoplasm: Cytohistologic Correlation and Accuracy Changyoung Yoo Hyun Joo Choi Soyoung
More information5/3/2017. Ahn et al N Engl J Med 2014; 371
Alan Failor, M.D. Clinical Professor of Medicine Division of Metabolism, Endocrinology and Nutrition University of Washington April 20, 2017 No disclosures to report 1. Appropriately evaluate s in adult
More informationRepeat Thyroid Nodule Fine-Needle Aspiration in Patients With Initial Benign Cytologic Results
Anatomic Pathology / REPEAT THYROID FINE-NEEDLE ASPIRATION Repeat Thyroid Nodule Fine-Needle Aspiration in Patients With Initial Benign Cytologic Results Melina B. Flanagan, MD, MSPH, 1 N. Paul Ohori,
More informationThe Frozen Section: Diagnostic Challenges and Pitfalls
The Frozen Section: Diagnostic Challenges and Pitfalls William C. Faquin, M.D., Ph.D. Director, Head and Neck Pathology Massachusetts General Hospital & Massachusetts Eye and Ear Infirmary Harvard Medical
More informationThe Bethesda Indeterminate Categories: An Update to Diagnosis and Molecular Testing
William C. Faquin, MD, PhD Professor of Pathology Harvard Medical School Director, Head and Neck Pathology Massachusetts Eye and Ear Massachusetts General Hospital The Bethesda Indeterminate Categories:
More informationTHE CONTRIBUTION OF CLINICAL AND RADIOLOGICAL FEATURES TO THE DIAGNOSIS IN AUS/FLUS AND FN/SFN THYROID NODULES
Acta Medica Mediterranea, 2016, 32: 151 THE CONTRIBUTION OF CLINICAL AND RADIOLOGICAL FEATURES TO THE DIAGNOSIS IN AUS/FLUS AND FN/SFN THYROID NODULES LUTFI DOGAN*, MEHMET ALI GULCELIK*, NIYAZI KARAMAN*,
More informationThe Bethesda System for Reporting Thyroid Cytopathology
AJCP / Special Article The Bethesda System for Reporting Thyroid Cytopathology Edmund S. Cibas, MD, 1 and Syed Z. Ali, MD 2 Key Words: Thyroid; Cytology; Fine-needle aspiration; Terminology Abstract To
More informationThyroid Cytopathology: What s New and What s Old That We Don t All Agree on?
Thyroid Cytopathology: What s New and What s Old That We Don t All Agree on? RITU NAYAR, MD PROFESSOR & VICE CHAIR OF PATHOLOGY NORTHWESTERN UNIVERSITY FEINBERG SCHOOL OF MEDICINE DIRECTOR OF CYTOPATHOLOGY,
More informationMolecular Markers in Fine Needle Aspirates of the Thyroid
Molecular Markers in Fine Needle Aspirates of the Thyroid Policy Number: 2.04.78 Last Review: 3/2014 Origination: 3/2013 Next Review: 3/2015 Policy Blue Cross and Blue Shield of Kansas City (Blue KC) will
More informationSPECIMEN PREPARATION AND ADEQUACY OF THE MATERIAL
SPECIMEN PREPARATION AND ADEQUACY OF THE MATERIAL Guido FADDA, MD, MIAC Head, Cytopathology Section Department of Anatomic Pathology and Laboratory Medicine Agostino Gemelli School of Medicine and Hospital
More informationSalivary Gland Cytology: A Clinical Approach to Diagnosis and Management of Atypical and Suspicious Lesions
Salivary Gland Cytology: A Clinical Approach to Diagnosis and Management of Atypical and Suspicious Lesions W.C. Faquin, M.D., Ph.D. Massachusetts General Hospital Harvard Medical School, USA Marc Pusztaszeri,
More informationMolecular Testing for Indeterminate Thyroid Nodules. October 20, 2018
Molecular Testing for Indeterminate Thyroid Nodules October 20, 2018 Patient 1: Left 1.0 cm AP x 1.6 cm transverse x 2.1 cm in length Well defined Isoechoic heterogeneous No calcification Grade 3 Vascularity
More informationThyroid nodules are a common clinical presentation, with
Original Research Endocrine Surgery Thyroid Ultrasound-Guided Fine-Needle Aspiration Cytology Results: Observed Increase in Indeterminate Rate over the Past Decade Otolaryngology Head and Neck Surgery
More informationRole of fine needle aspiration cytology and cytohistopathological co-relation in thyroid lesions: experience at a tertiary care centre of North India
International Journal of Research in Medical Sciences Chandra S et al. Int J Res Med Sci. 2016 Oct;4(10):4552-4556 www.msjonline.org pissn 2320-6071 eissn 2320-6012 Research Article DOI: http://dx.doi.org/10.18203/2320-6012.ijrms20163328
More informationEnterprise Interest None
Enterprise Interest None Risk stratification of salivary gland lesions on cytology based on the proposed Milan System for reporting salivary gland cytopathology: A pilot study Kartik Viswanathan, M.D.,
More informationFollicular Derived Thyroid Tumors
Follicular Derived Thyroid Tumors Jennifer L. Hunt, MD, MEd Aubrey J. Hough Jr, MD, Endowed Professor of Pathology Chair of Pathology and Laboratory Medicine University of Arkansas for Medical Sciences
More informationDownloaded from by John Hanna on 11/09/15 from IP address Copyright ARRS. For personal use only; all rights reserved
Neuroradiology/Head and Neck Imaging Original Research Zhu et al. Ultrasound Versus Afirma Testing of FNA-Indeterminate Thyroid Nodules Neuroradiology/Head and Neck Imaging Original Research Qing-Li Zhu
More informationClinical performance and utility of Afirma GEC in a community hospital practice
Clinical performance and utility of Afirma GEC in a community hospital practice Michael Traynor, Jacob Torrison, Faculty: Hallanger-Johnson JE, Newman DW, and Beal JR PURPOSE: To assess the performance
More informationClinical Significance of Distinguishing Between Follicular Lesion and Follicular Neoplasm in Thyroid Fine-Needle Aspiration Biopsy
Ann Surg Oncol (2009) 16:3146 3153 DOI 10.1245/s10434-009-0666-3 ORIGINAL ARTICLE ENDOCRINE TUMORS Clinical Significance of Distinguishing Between Follicular Lesion and Follicular Neoplasm in Thyroid Fine-Needle
More informationComparison of Thyroid Fine-Needle Aspiration and Core Needle Biopsy
Anatomic Pathology / THYROID FNA AND CORE NEEDLE BIOPSY Comparison of Thyroid Fine-Needle Aspiration and Core Needle Biopsy Andrew A. Renshaw, MD, 1 and Nat Pinnar, MD 2 Key Words: Thyroid; Neoplasia;
More informationPathology Reporting of Thyroid Core Needle Biopsy: A Proposal of the Korean. Endocrine Pathology Thyroid Core Needle Biopsy Study Group
Pathology Reporting of Thyroid Core Needle Biopsy: A Proposal of the Korean Endocrine Pathology Thyroid Core Needle Biopsy Study Group Chan Kwon Jung 1 Hye Sook Min 2,3 Hyo Jin Park 2 Dong Eun Song 4 Jang
More informationOverview of Indeterminate Cytology
83 rd Annual Meeting American Thyroid Association Overview of Indeterminate Cytology Scott Boerner MD FRCPC Head Cytopathology, University Health Network University of Toronto DISCLOSURE Nothing to disclose
More informationMaterials and Methods
The Clinical and Diagnostic Impact of Using Standard Criteria of Adequacy Assessment and Diagnostic Terminology on Thyroid Nodule Fine Needle Aspiration Xin Jing, M.D., Claire W. Michael, M.D., and Robert
More informationAtypia of undetermined significance on thyroid fine needle aspiration: surgical outcome and risk factors for malignancy
ORIGINAL ARTICLE pissn 2288-6575 eissn 2288-6796 http://dx.doi.org/10.4174/astr.2014.86.3.109 Annals of Surgical Treatment and Research Atypia of undetermined significance on thyroid fine needle aspiration:
More informationJMSCR Vol 06 Issue 01 Page January 2018
www.jmscr.igmpublication.org Impact Factor 5.84 Index Copernicus Value: 71.58 ISSN (e)-2347-176x ISSN (p) 2455-0450 DOI: https://dx.doi.org/10.18535/jmscr/v6i1.126 Study of Fine Needle Aspiration Cytology
More informationPitfalls in thyroid tumor pathology. Prof.Valdi Pešutić-Pisac MD, PhD
Pitfalls in thyroid tumor pathology Prof.Valdi Pešutić-Pisac MD, PhD Too many or... Tumour herniation through a torn capsule simulating capsular invasion fibrous capsule with a sharp discontinuity, suggestive
More information3/27/2017. Disclosure of Relevant Financial Relationships. Each year over 550,000 thyroid FNAs are performed in the U.S.!!! THYROID FNA: THE GOOD NEWS
Disclosure of Relevant Financial Relationships William C. Faquin, MD, PhD Director, Head and Neck Pathology Massachusetts Eye and Ear Massachusetts General Hospital Professor of Pathology Harvard Medical
More informationCase # year old man with a 2 cm right kidney mass
Case # 4. 52 year old man with a 2 cm right kidney mass Figure 1 Figure 2 Figure 3 Figure 4 Diagnosis: Negative/Non-diagnostic Normal kidney tissue Fine needle aspiration (FNA) of the kidney is performed
More informationThyroid Nodules. Family Medicine Refresher Course Geeta Lal MD, FACS April 2, No financial disclosures
Thyroid Nodules Family Medicine Refresher Course Geeta Lal MD, FACS April 2, 2014 No financial disclosures Objectives Review epidemiology Work up of Thyroid nodules Indications for FNAB Evolving role of
More informationRelationship of Cytological with Histopathological Examination of Palpable Thyroid Nodule
Relationship of Cytological with Histopathological Examination of Palpable Thyroid Nodule NAUSHEEN HENNA 1, SHAHZAD AHMED FAKHAR 2, NAVEED AKHTER 3, MUHAMMAD MASOOD AFZAL 4, KHIZER AFTAB AHMAD KHAN 5,
More informationSuspicious Cytologic Diagnostic Category in Endoscopic Ultrasound-Guided FNA of the Pancreas: Follow-Up and Outcomes
Suspicious Cytologic Diagnostic Category in Endoscopic Ultrasound-Guided FNA of the Pancreas: Follow-Up and Outcomes Evan A. Alston, MD 1 ; Sejong Bae, PhD 2 ; and Isam A. Eltoum, MD, MBA 1 BACKGROUND:
More information8 Classifying Your Thyroid FNA Specimens Using Bethesda Terminology: Use of Adjunct Molecular Reflex Testing
8 Classifying Your Thyroid FNA Specimens Using Bethesda Terminology: Use of Adjunct Molecular Reflex Testing Constantine Theoharis MD, FASCP David Chhieng MD, FASCP 2011 Annual Meeting Las Vegas, NV AMERICAN
More informationMedical Policy Manual. Topic: Molecular Markers in Fine Needle Aspirates of the Thyroid. Date of Origin: April 2013
Medical Policy Manual Topic: Molecular Markers in Fine Needle Aspirates of the Thyroid Date of Origin: April 2013 Section: Genetic Testing Last Reviewed Date: April 2014 Policy No: 49 Effective Date: July
More informationCYTOPATHOLOGY OF FOLLICULAR CELL NODULES
104 th Annual USCAP Meeting Boston, March 21-27, 2015 Endocrine Pathology Society. March 21, 2015 Follicular cell-derived tumors of the thyroid gland, a practical update CYTOPATHOLOGY OF FOLLICULAR CELL
More informationNoninvasive follicular thyroid neoplasm with papillary-like nuclear features: a single-institutional experience in Japan
2017, 64 (12), 1149-1155 Original Noninvasive follicular thyroid neoplasm with papillary-like nuclear features: a single-institutional experience in Japan Mitsuyoshi Hirokawa 1), Miyoko Higuchi 2), Ayana
More informationClinical and Molecular Approach to Using Thyroid Needle Biopsy for Nodular Disease
Clinical and Molecular Approach to Using Thyroid Needle Biopsy for Nodular Disease Robert L. Ferris, MD, PhD Department of Otolaryngology/Head and Neck Surgery and Yuri E. Nikiforov, MD, PhD Division of
More informationRE-AUDIT OF THYROID FNA USING THE THY GRADING SYSTEM AND HISTOLOGY AT SUNDERLAND ROYAL HOSPITAL, 2011
Audit: RE-AUDIT OF THYROID FNA USING THE THY GRADING SYSTEM AND HISTOLOGY AT SUNDERLAND ROYAL HOSPITAL, 2011 Auditors: Dr Lena Wilkinson SpR Histopathology Dr. Debra Milne Consultant Histocytopathologist
More informationAn Alphabet Soup of Thyroid Neoplasms
Overall Objectives An Alphabet Soup of Thyroid Neoplasms Lester D. R. Thompson www.lester-thompson.com What is the current management of papillary carcinoma? What are the trends and what can we do differently?
More informationEvaluation and Management of Thyroid Nodules. Overview of Thyroid Nodules and Their Management. Thyroid Nodule detection: U/S versus Exam
Overview of Thyroid Nodules and Their Management Matthew D. Ringel, M.D. Professor of Medicine Divisions of Endocrinology and Oncology, The Ohio State University Co-Director, Thyroid Cancer Unit Arthur
More informationISSN X (Print) *Corresponding author Dr. Yasmeen Khatib
Scholars Journal of Applied Medical Sciences (SJAMS) Sch. J. App. Med. Sci., 2016; 4(3D):916-923 Scholars Academic and Scientific Publisher (An International Publisher for Academic and Scientific Resources)
More informationImproving the Long Term Management of Benign Thyroid Nodules
25 th Annual Scientific AACE Clinical Congress Improving the Long Term Management of Benign Thyroid Nodules Stephanie L. Lee, MD, PhD Director, Thyroid Health Center Section of Endocrinology, Diabetes
More informationObjectives. Salivary Gland FNA: The Milan System. Role of Salivary Gland FNA 04/26/2018
Salivary Gland FNA: The Milan System Dr. Jennifer Brainard Section Head Cytopathology Cleveland Clinic Objectives Introduce the Milan System for reporting salivary gland cytopathology Define cytologic
More information(1) Endocrinologists do not have the training and do not possess the skills to perform specimen adequacy assessment.
February 20, 2014 Kathleen Todd, MT (ASCP) Medical Technologist Division of Laboratory Services Survey and Certification Group Centers for Medicare & Medicaid Services 7500 Security Blvd. (Mailstop: C2-21-16)
More informationMalignancy Rate in Thyroid Nodules Classified as Bethesda Category III (AUS/FLUS)
Journal Articles Donald and Barbara Zucker School of Medicine Academic Works 2014 Malignancy Rate in Thyroid Nodules Classified as Bethesda Category III (AUS/FLUS) A. S. Ho E. E. Sarti K. S. Jain H. J.
More informationPathology of the Thyroid
Pathology of the Thyroid Thyroid Carcinoma Arising from Follicular Cells 2015-01-19 Prof. Dr. med. Katharina Glatz Pathologie Carcinomas Arising from Follicular Cells Differentiated Carcinoma Papillary
More information