STUDY. Differences in Biopsy Techniques of Actinic Keratoses by Plastic Surgeons and Dermatologists. the most common reasons
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1 STUDY Differences in Biopsy Techniques of Actinic Keratoses by Plastic Surgeons and Dermatologists A Histologically Controlled Pilot Study Klaus Sellheyer, MD; Wilma F. Bergfeld, MD Objective: To compare differences in biopsy techniques of actinic keratoses between dermatologists and plastic surgeons. Design: Blinded, comparative, retrospective study. Setting: Dermatopathology laboratory at a major academic medical center with referral of outside cases. Intervention: We reexamined the histopathologic slides of 5 actinic keratosis biopsy specimens obtained by plastic surgeons and dermatologists from January 1, 1992, through May 31, 22. We were specifically interested in the type of biopsy technique (shave, punch, or excisional biopsy) used for the surgical management of actinic keratoses by both groups of physicians. We also recorded the clinical diagnoses rendered on the dermatopathology request form and compared them with the histopathologic diagnoses. Results: Excisional biopsies were performed by plastic surgeons in 5. of the cases, compared with only 1.4 by dermatologists. In contrast, shave biopsies of actinic keratoses were performed by plastic surgeons in only 32.4 of the cases, compared with 89.4 by dermatologists. Only 1 (.5) of the 198 dermatopathology request forms submitted by the plastic surgeons mentioned actinic keratosis, compared with 82 (39.6) of 27 histopathologic evaluation requests submitted by dermatologists. Conclusions: The predominance of excisional biopsies of actinic keratoses by plastic surgeons may be related to a different ability in the clinical recognition of actinic keratoses comparedwiththatofdermatologists. Thesurgicalapproach of dermatologists to shave diagnostically uncertain cutaneous lesions is less invasive than that of plastic surgeons and is more likely to achieve a better cosmetic outcome. Arch Dermatol. 26;142: Author Affiliations: Department of Anatomic Pathology, Section of Dermatopathology, The Cleveland Clinic Foundation, Cleveland, Ohio. ACTINIC KERATOSIS IS ONE OF the most common reasons for patients to consult a dermatologist. In , there were 7.2 million office-based visits to US physicians because of actinic keratoses. 1 Dermatologists treated 83.2 of the patients. Cryosurgery is the preferred method of treatment because it is cost-effective and has a high degree of patient acceptance. According to the guidelines of care established by the Task Force on Actinic Keratoses and endorsed by the American Academy of Dermatology, excision of actinic keratoses only occasionally is an accepted method of treatment. 2 In diagnostically uncertain cases, biopsy is often performed. We were interested to determine whether there are differences in the biopsy techniques used by dermatologists and plastic surgeons. Among the surgical specialties, we chose plastic surgeons because, with the exception of dermatologists, they submitted the largest number of actinic keratoses for histopathologic examination. METHODS RETRIEVAL OF CASES In this retrospective study, we retrieved and reexamined the histopathologic slides of 5 actinic keratosis biopsy specimens obtained by plastic surgeons and dermatologists from January 1, 1992, through May 31, 22, who submitted their specimens for histopathologic evaluation to the Section of Dermatopathology, The Cleveland Clinic Foundation, Cleveland, Ohio. The Section of Dermatopathology functions as a referral center for dermatopathologic specimens for physicians in Ohio. All slides represented hematoxylin-eosin stained sections from archival material. They included 198 actinic keratoses treated by 7 plastic surgeons and 27 actinic keratoses treated by 26 dermatologists. The cases were randomly selected from a computer-generated database. No repeat excision specimens, in which the diagnosis was known, were enrolled in the study. All subsequent data were recorded as anonymous. The project was approved by the Internal Review Board of The Cleveland Clinic Foundation. 455
2 ASSESSMENT /27 64/198 19/27 35/198 Dermatologists Plastic Surgeons 3/27 99/198 Figure 1. Percentage of surgical methods used by plastic surgeons and dermatologists in the treatment of actinic keratoses. The differences in the use of shave and punch biopsies and of excisions were statistically significant (see text for P values). The histopathologic slides were reexamined by one dermatopathologist (K.S.) blinded to the subspecialty of the physicians submitting the specimens. At review of the slides, the actinic keratoses were histopathologically classified as either hyperplastic types or other variants, including atrophic, acantholytic, lichenoid, bowenoid, and pigmented variants, which were grouped together. This differentiation was done because hyperplastic actinic keratoses may be clinically mistaken for invasive squamous cell carcinomas. The biopsy techniques (punch, shave, or excisional) used to surgically treat the keratoses were entered on the data sheet. Separate from the histopathologic evaluation, our section secretary recorded the clinical diagnosis and the anatomical location from which each specimen was obtained. In addition, we evaluated the concordance between clinical and histopathologic diagnoses. This was performed blindly without knowledge of the subspecialty of the treating physician. Using the histopathologic diagnosis as the gold standard, we carefully avoided being overstringent when we considered a clinical diagnosis rendered by the submitting clinician to be incorrect. We identified a clinical diagnosis as correct if the clinician listed several alternatives, for example, basal cell carcinoma, squamous cell carcinoma, or actinic keratosis, and when an actinic keratosis was confirmed at histopathologic analysis. If only 1 clinical diagnosis was listed, for example, basal cell carcinoma, the clinical diagnosis was considered incorrect, as was the lack of provision of any clinical data. Unspecific clinical data, such as lesion, were also considered incorrect. After all data were retrieved and blindly evaluated, the cases were matched with the subspecialty of the treating physician and grouped into those submitted by the plastic surgeons and those submitted by the dermatologists. The data from both physician groups were then compared with each other. STATISTICAL ANALYSIS The comparison of both groups was performed using the 2 test of association. The Fisher exact test was applied when frequencies or group sizes made the 2 test results questionable (determined by an expected 2 2 cell count 5). Initially, an overall group comparison between plastic surgeons and dermatologists was done to address the question of whether the distribution of responses (among punch, shave, and excisional biopsy specimens) was different between both groups of physicians. Subsequently, individual comparisons of the frequency of each biopsy type were performed to more specifically evaluate how the groups differ. Statistical significance was set at P.5. RESULTS When analyzing all actinic keratoses combined, plastic surgeons performed excisional biopsies in 5. of the cases, compared with only 1.4 by dermatologists (P.1) (Figure 1 and Figure 2). In contrast, shave biopsies of actinic keratoses were performed by plastic surgeons in only 32.4 of the cases but by dermatologists in 89.4 of the cases (P.1) (Figure 1). The difference in the use of punch biopsies between both physician groups was less pronounced but still statistically significant (P=.2) (Figure 1). There was no difference in the biopsy approach chosen by the dermatologists when the actinic keratoses were classified as either the hyperplastic type or other variants (atrophic, acantholytic, lichenoid, bowenoid, or pigmented) and were compared with each other (Figure 3A). Plastic surgeons had a slightly higher tendency to perform excisional biopsies in cases of actinic keratoses of the hyperplastic type (63) compared with A B Figure 2. Histopathologic specimen from an acantholytic actinic keratosis excised by a plastic surgeon (A) compared with a shave biopsy specimen of the same type of actinic keratosis treated by a dermatologist (B) (original magnification 16). Insets focus on the actinic changes at a higher power (original magnification 1). 456
3 1 A 1 B All Actinic Keratoses Except Hyperplastic Subtype Actinic Keratoses, Hyperplastic Subtype /1 43/47 15/1 4/47 Dermatologists 3/1 /47 58/162 6/36 28/162 7/36 Plastic Surgeons 76/162 23/36 Figure 3. Percentage of surgical methods used by dermatologists (A) and plastic surgeons (B) in the treatment of actinic keratoses. The actinic keratoses were grouped as hyperplastic type vs all other variants (for further explanation see Assessment subsection of the Methods section). The only statistically significant difference found was in the group of plastic surgeons who performed fewer shave biopsies in treatment of hyperplastic actinic keratoses compared with the other variants (P=.4). the other variants (47.7). This was not statistically significant (P=.1) (Figure 3B). The only statistically significant difference found in the group of plastic surgeons was the lower number of shave biopsies in cases of hyperplastic actinic keratoses (16.7) compared with the other variants (34.2) (P=.4) (Figure 3B). Overall, however, with only 36 cases, the total number of hyperplastic actinic keratoses treated by plastic surgeons was low, making the comparisons difficult. Of the 99 excisional biopsies performed on actinic keratoses by plastic surgeons, 57 were located in the central face (Table). Of the 7 plastic surgeons who submitted specimens of actinic keratoses, 5 performed more excisional biopsies than shave and punch biopsies. One of the other 2 plastic surgeons submitted only 5 cases of actinic keratoses, making a useful analysis impossible. The other plastic surgeon, who performed more shave biopsies than excisional biopsies, submitted only 36 (18.2) of the 198 cases of actinic keratoses analyzed. Over the study period from January 1, 1992, through May 31, 22, there was a higher tendency for the plastic surgeons to use shave biopsies compared with excisional biopsies. This was mainly due to 1 of the 7 plastic surgeons. In 21, the last entire year analyzed in the study period, 12 (37.5) of 32 actinic keratoses were performed as excisional biopsies by plastic surgeons, compared with none by dermatologists. Only 1 (.5) of the 198 dermatopathology request forms submitted by the plastic surgeons mentioned actinic keratosis, compared with 82 (39.6) of 27 histopathologic evaluation requests from dermatologists. In the single case of a specific clinical diagnosis of an actinic keratosis reported by a plastic surgeon, a shave biopsy was performed. The most common statements by plastic surgeons made on the dermatopathology request form were lesion or multiple skin lesions. Some reports were more specific and mentioned rule out squamous cell carcinoma, squamous cell carcinoma, or basal cell carcinoma. In the case of the 3 excisional biopsy specimens of actinic keratoses performed by the dermatologists in 1995, Table. Number of Excisions per Anatomic Area Performed by Plastic Surgeons for Treatment of Actinic Keratoses* Anatomic Area Central face (chin, nose, cheek, and forehead) 56 Peripheral face (temple and ears) 11 Scalp 6 Neck 3 Trunk 4 Upper extremities 15 Lower extremities 2 Unspecified 2 Total 99 *Comparable data for dermatologists are not given because they performed excision biopsies in only 3 of 27 actinic keratoses. 1999, and 22, the clinical diagnosis on the dermatopathology request form was recorded as rule out verruca vulgaris vs intradermal nevus, history of squamous cell carcinoma, and basal cell carcinoma. COMMENT In 1997, million of 73 million physician office visits in the United States were for skin examinations. 3 For the diagnosis of actinic keratosis and nonmelanoma skin cancer alone, published data are available from the National Ambulatory Medical Care Survey for 1993 and During that time, 13.5 million physician office visits were recorded for these conditions. That proportion may likely be higher today because of heightened public awareness of the prevalence of precancerous and cancerous skin conditions. While most actinic keratoses are treated by dermatologists, a smaller percentage of cases are treated by other physician groups. 1,4 In cases of diagnostic uncertainty, for example, to rule out invasive squamous cell carcinoma, a biopsy is performed. In our retrospective and 457
4 blinded study, our objective was to determine differences in biopsy techniques used by dermatologists and plastic surgeons. We analyzed the biopsy approach to 5 actinic keratoses submitted during 1 years by both specialties. The cases were randomly selected from a computer-generated database, excluding any sampling bias. While we believe that the results show clear evidence of a difference in the bioptic management of actinic keratoses between the 2 specialties, the study is limited by the small numbers of dermatologists and plastic surgeons studied. The results from this pilot study clearly suggest that a larger, multi-institutional study is needed. We found that the bioptic approach used by dermatologists consisted of shave biopsy in almost 9 (89.4) of 1 cases. Dermatologists performed excisional biopsies in only a fraction (1.4) of actinic keratoses. This was in sharp contrast to plastic surgeons, who performed excisional biopsies in 5. of cases, with more than half (56.6) located in the cosmetically important central face. Based on these numbers, we believe that the care provided by dermatologists in the evaluation and treatment of actinic keratoses may be more costeffective than care by plastic surgeons. The high percentage of excisional biopsies performed by a surgical subspecialty for a cutaneous lesion confined to the level of the epidermis, for which a superficial shave biopsy would have sufficed, raises the question of why this treatment was chosen. There are probably multiple answers. The treatment options of dermatologists for skin conditions are typically and naturally much broader than those of plastic surgeons and include cryosurgery, electrosurgery, curettage, dermabrasion, and chemical destruction. 5 Because of the prevalence of non scalpel-based methods for the treatment of actinic keratoses, a more hesitant use of the scalpel by dermatologists 6 is likely in cases of diagnostic uncertainty, resulting in a preference for superficial shave biopsies. Depending on the histopathologic evaluation of the removed specimen, a second, deeper procedure (excision) may follow. This ensures against an unnecessary deep, wide excision with a cosmetically less favorable outcome. We cannot exclude that there are differences in perceptions between dermatologists and plastic surgeons of which procedures lead to better cosmetic outcomes. Another reason for the predominance of excisional biopsies by plastic surgeons may be related to a different ability in the clinical recognition of actinic keratoses compared with that of dermatologists. Numerous studies have documented that dermatologists are far more capable of recognizing skin lesions than other specialists are A recent article compared the histopathologic diagnosis with the clinical diagnosis of oculoplastic surgeons who treated cutaneous periocular lesions. 18 For actinic keratoses, a low concordance rate was found between clinical impression and histopathologic evaluation. Actinic keratoses constituted only a small percentage of the conditions treated by oculoplastic surgeons. A correct clinical preoperative diagnosis (or differential diagnosis) of a skin lesion ensures that the appropriate procedure is chosen. In the case of seborrheic keratoses, lesions that were clinically correctly identified by the treating physician were more than 8 times more likely to receive appropriate care. 7 The study also concluded that dermatologists provided appropriate care in 9 of cases of seborrheic keratoses vs only 38 by plastic surgeons and 13 by general surgeons. 7 The procedures performed for the treatment of seborrheic keratoses and deemed by the authors to be appropriate included curettage, shave biopsy, and punch biopsy; excision was deemed inappropriate for the surgical care of seborrheic keratoses. We cannot exclude that there are systematic differences in the types of patients consulting dermatologists and plastic surgeons that could explain why different biopsy approaches were used by the 2 specialties. It is possible that patients consulting plastic surgeons seem to have more clinically advanced skin lesions, such as an invasive squamous cell carcinoma, precipitating a more aggressive therapeutic approach. However, hyperplastic actinic keratoses, which may clinically be mistaken for invasive carcinoma, made up only 23 (25.6) of all actinic keratoses excised by the plastic surgeons in our study. The remaining 76 (76.8) were of the nonhyperplastic type and were still excised. Only.5 of the dermatopathology request forms submitted by the plastic surgeons in our study mentioned actinic keratosis as a clinical diagnosis, compared with 39.6 of histopathologic evaluation requests from dermatologists. In the single case of a specific clinical diagnosis of an actinic keratosis reported by a plastic surgeon, the appropriate surgical method of shave biopsy was performed. While the statements on the dermatopathology request forms may not necessarily indicate the exact clinical diagnostic accuracy of the submitting physician, they are certainly indicative of the uncertainty in the clinical recognition of skin lesions by plastic surgeons. The frequent use of nonspecific descriptions such as lesion or multiple skin lesions by plastic surgeons is a further indication for such lack. The use of descriptive, nonspecific terms for skin conditions by nondermatologists is also well documented in the literature. 7,19,2 This clinical diagnostic uncertainty may have been another reason for the frequent use of excisional biopsies. Our study is limited by being confined to the clinical practice of 7 plastic surgeons who submitted cases for histopathologic evaluation to our institution. However, despite these limitations, we believe we have documented a tendency of a surgical subspecialty to be more inclined to use invasive diagnostic surgical procedures more often than necessary. Our conclusion is supported by recent data on the frequency of high-intensity procedures (excisions and repair procedures) chosen by nondermatologists, including plastic surgeons, as a choice for the treatment of seborrheic keratosis. 21 Dermatologists treated 89 of seborrheic keratoses using lowintensity procedures (punch and shave biopsy), compared with 51 of other specialties. Our conclusion is also supported by an earlier study that found that 61 of seborrheic keratoses were excised by plastic surgeons vs only 4 excised by dermatologists. 7 The bioptic approach to actinic keratoses by these 2 specialties is not different from that chosen for seborrheic keratoses. While we realize that our study is a snapshot of a local experience that involves primarily 2 specialties submitting specimens to 1 institution, we believe that the 458
5 results represent current practice. However, the results from this pilot study clearly suggest that a larger, multiinstitutional study is needed. Accepted for Publication: May 17, 25. Correspondence: Klaus Sellheyer, MD, Department of Anatomic Pathology, Section of Dermatopathology, The Cleveland Clinic Foundation, 95 Euclid Ave, L25, Cleveland, OH (sellhek@ccf.org). Author Contributions: Study concept and design: Sellheyer. Acquisition of data: Sellheyer. Analysis and interpretation of data: Sellheyer and Bergfeld. Drafting of the manuscript: Sellheyer. Critical revision of the manuscript for important intellectual content: Sellheyer and Bergfeld. Administrative, technical, and material support: Sellheyer and Bergfeld. Financial Disclosure: None. Acknowledgment: We thank Char Cook, Department of Laboratory Information Services, for her excellent help with the data retrieval; Mary Krosse, Section of Dermatopathology, for retrieving and recording the clinical information; Jeffrey Hammel, MS, Collaborative Biostatistics Center, for performing the tests for statistical significance; and Ken Kula, Department of Medical Illustrations, for drawing the figures. REFERENCES 1. Smith ES, Feldman SR, Fleischer AB Jr, Leshin B, McMichael A. Characteristics of office-based visits for skin cancer: dermatologists have more experience than other physicians in managing malignant and premalignant skin conditions. Dermatol Surg. 1998;24: Drake LA, Ceilley RI, Cornelison RL, et al; Committee on Guidelines of Care. Guidelines of care for actinic keratoses. J Am Acad Dermatol. 1995;32: Feldman SR, Fleischer AB Jr. Skin examinations and skin cancer prevention counseling by US physicians: a long way to go. J Am Acad Dermatol. 2;43: Fleischer AB Jr, Feldman SR, White RE, Leshin B, Byington R. Procedures for skin diseases performed by physicians in 1993 and 1994: analysis of data from the National Ambulatory Medical Care Survey. J Am Acad Dermatol. 1997; 37: The American Academy of Dermatology Joint AAD/ASDS Liaison Committee. Current issues in dermatologic office-based surgery. Dermatol Surg. 1999; 25: Grabski WJ, Salasche SJ, Mulvaney MJ. Razor-blade surgery. J Dermatol Surg Oncol. 199;16: Stern RS, Boudreaux C, Arndt KA. Diagnostic accuracy and appropriateness of care for seborrheic keratoses: a pilot study of an approach to quality assurance for cutaneous surgery. JAMA. 1991;265: Ramsay DL, Fox AB. The ability of primary care physicians to recognize the common dermatoses. Arch Dermatol. 1981;117: Clark RA, Rietschel RL. The cost of initiating appropriate therapy for skin diseases: a comparison of dermatologists and family physicians. J Am Acad Dermatol. 1983;9: Norman GR, Rosenthal D, Brooks LR, Allen SW, Muzzin LJ. The development of expertise in dermatology. Arch Dermatol. 1989;125: Federman D, Hogan D, Taylor JR, Caralis P, Kirsner RS. A comparison of diagnosis, evaluation, and treatment of patients with dermatologic disorders. JAm Acad Dermatol. 1995;32: Kirsner RS, Federman DG. Lack of correlation between internists ability in dermatology and their patterns of treating patients with skin disease. Arch Dermatol. 1996;132: Federman DG, Kirsner RS. The abilities of primary care physicians in dermatology: implications for quality of care. Am J Manag Care. 1997;3: Marks R, Jolley D, McCormack C, Dorevitch AP. Who removes pigmented skin lesions? J Am Acad Dermatol. 1997;36: Whited JD, Hall RP, Simel DL, Horner RD. Primary care clinicians performance for detecting actinic keratoses and skin cancer [published correction appears in Arch Intern Med. 1997;157:1686]. Arch Intern Med. 1997;157: Gerbert B, Bronstone A, Wolff M, et al. Improving primary care residents proficiency in the diagnosis of skin cancer. J Gen Intern Med. 1998;13: Fleischer AB Jr, Herbert CR, Feldman SR, O Brien F. Diagnosis of skin disease by nondermatologists. Am J Manag Care. 2;6: Hillson TR, Harvey JT, Hurwitz JJ, Liu E, Oestreicher JH, Pashby RC. Sensitivity and specificity of the diagnosis of periocular lesions by oculoplastic surgeons. Can J Ophthalmol. 1998;33: Brodkin RH, Rickert R, Machler BC. The dermatologist and managed care. Cutis. 1996;58: DeCoste SD, Stern RS. Diagnosis and treatment of nevomelanocytic lesions of the skin: a community-based study. Arch Dermatol. 1993;129: Duque MI, Jordan JR, Fleischer AB Jr, et al. Frequency of seborrheic keratosis biopsies in the United States: a benchmark of skin lesion care quality and cost effectiveness. Dermatol Surg. 23;29:
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