Pulmonary Nodules & Masses A Diagnostic Approach Heber MacMahon The University of Chicago Department of Radiology
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What is a Pulmonary Nodule?
What is a Pulmonary Nodule?
What is a Pulmonary Nodule?
Pulmonary Nodule A rounded opacity, well or poorly defined, measuring up to 3 cm in diameter
28 year-old female with history of marijuana use and chronic cough.
Mucinous Adenocarcinoma
90% of peripheral cancers visible in retrospect (Muhm 1983)
Missed Lung Cancers : JHM Austin et al. Rad 1992;182:115-122 Size: 0.6 3.4 cm (mean 1.6) Location : Upper lobes 81% Conspicuity : Overlapping bones in 82%
74 y/o man with COPD and rales
Lung Carcinoma 74 y/o man with COPD and rales
Conventional CXR Dual energy soft tissue image
Bone Suppression Imaging Standard CXR BSI CXR DES CXR
69 y/o female with hx of multiple myeloma
69 y/o female with hx of multiple myeloma Standard CXR ST image
69 y/o female with hx of multiple myeloma Standard CXR Bone image
Standard Thoracic CT Protocol; University of Chicago 2016 Key 1mm 3mm 3mm Cor MIPs MINIPs Sag Source Scout Scout Dose Contrast
MIP 1mm thin section
MIP 1mm thin section Zoom
? Nodule
Axial Coronal Sagittal
Diagnostic Features of Nodules Size Morphology Growth rate Calcification
6mm metastasis
Percentage of Lung Cancers Detected by CXR According to Size 100 90 80 70 60 50 40 30 20 10 0 2-5mm 6-10mm 11-20mm 21-45mm Adapted from : Henschke et al. Lancet 1999;354 99-105
Nodule Size and Probability of Malignancy Size ELCAP Mayo Nelson PanCan <3mm 0.1% 2-5mm <1% 0.4% <0.4% 4-7mm 0.7% 6-10mm 24% 8-20mm 18.7% 21-30mm 33.3% 21-45mm 80%
Diagnostic Features of Nodules Size Morphology Growth rate Calcification Overall Shape Solid/Non-solid Edge features-spiculated -Lobulated -Smooth
Ground Glass Nodule Solid Nodule
Smooth
Smooth Lobulated
Smooth Lobulated Spiculated
Smooth Lobulated Spiculated Part-Solid
Diagnostic Features of Nodules Size Margins Growth rate Calcification
Growth rate of nodules Volume doubling time (VDT): 26% diameter increase = One volume doubling
Growth rate of nodules Volume doubling time (VDT): 26% diameter increase = One volume doubling Typical lung ca. VDT = 100 200 days Range = 30 400 + days
Growth rate of Small Cancers (Hasegawa BJR 2000) Parameter Mean VDT (Days) <10mm 536 >20mm 299 Smoker 292 Non-smoker 607 Adenoca 533 Squamous 129 Small cell 97 GGO 813 Mixed Solid 457 149
ARS #1 Incidental finding in a 58 year old former smoker
ARS #1 The MOST likely diagnosis is: (1) Indolent fungal infection. (2) Chronic organizing pneumonia (3) Atypical adenomatous hyperplasia (4) Nodular fibrosis (5) Invasive adenocarcinoma
Part-Solid and Non-Solid Nodules in a Screening Program Henschke et al. AJR 2002 ;178:1053-1057 Part-solid: 63% malignant Non-solid: 18% malignant Solid: 7% malignant
Persistent Non-Solid nodules 53 NS nodules in 49 pts Persisted or grew for > 1 month 75% were adenoca/ BAC 6% AAH 19% Nodular fibrosis/organizing pna Kim et al. Radiology 2007 245,1 p267
Lung Cancer: Major cell types Adenocarcinoma (50%)
Adenocarcinoma Up to 50% of lung cancers 55% present as peripheral nodule, often sub-solid May grow very slowly over years Some associated with pulmonary fibrosis
Lung Cancer: Major cell types Adenocarcinoma (50%) - Bronchioloalveolar (5%)
Lung Cancer: Major cell types Adenocarcinoma (50%) - Bronchioloalveolar (5%)
Lung Adenocarcinoma Classification AAH :Atypical Adenomatous Hyperplasia AIS : Adenoca in Situ MIA : Minimally Invasive Adenoca LPA : (Invasive) Lepidic Predominant Adenoca International Association for the Study of Lung Cancer/American Thoracic Society/European Respiratory Society International Multidisciplinary Classification of Lung Adenocarcinoma. WD Travis et al. Journal of Thoracic Oncology Volume 6, Number 2, February 2011
Lung Adenocarcinoma Classification AAH :Atypical Adenomatous Hyperplasia AIS : Adenoca in Situ MIA : Minimally Invasive Adenoca LPA : (Invasive) Lepidic Predominant Adenoca Non-Mucinous Mucinous International Association for the Study of Lung Cancer/American Thoracic Society/European Respiratory Society International Multidisciplinary Classification of Lung Adenocarcinoma. WD Travis et al. Journal of Thoracic Oncology Volume 6, Number 2, February 2011
Atypical Adenomatous Hyperplasia (AAH) Typically GGO <5mm Precursor of adenoca Found in 20% + of lobes resected for lung ca
Ground Glass Nodule 7-07 12-08 4-09
MIA
MIA -> Invasive lepidic predominant adenoca 1-09 1-10 12-10
Spectrum of Sub-solid Nodules GGO Part Solid Part Solid & Cystic
Mucinous Adenocarcinoma
Lung Cancer: Major cell types Adenocarcinoma (50%) Squamous cell (30%)
Squamous Cell Carcinoma 75% arise from segmental or larger bronchi 20% show central necrosis & cavitation 17% present with atelectasis
Small Cell Lung Cancer
Small-Cell Carcinoma 15-20% of lung cancers Early metastases, mediastinal adenopathy Strongest association with cigarette smoking Ectopic ACTH, inappropriate ADH
Lung Cancer: Major cell types Adenocarcinoma (50%) Squamous cell (30%) Small cell Undifferentiated (15%) Large cell Undifferentiated (5%)
Large Cell Undifferentiated Carcinoma 2-5%% of lung cancers 50% present as large peripheral mass May show very rapid growth Poor prognosis
Diagnostic Features of Nodules Size Margins Growth rate Calcification
Regarding calcification in lung nodules, which of the following statements is false: ARS #2 (1) Focal central calcification is reliable evidence of benignancy. (2) Eccentric calcification is highly suggestive of malignancy. (3) Popcorn calcification is associated with hamartomas. (4) Calcification is detectable by CT in about 6-10% of lung cancers. (5) Laminar calcification is associated with healed post infectious granulomas.
Patterns of Calcification Central Laminated Eccentric Popcorn Diffuse Stippled
Patterns of Calcification Benign Indeterminate Central Laminated Eccentric Popcorn Diffuse Stippled
Dystrophic Calcification in Lung Cancer
Calcified Lung Carcinoma Calcium detectable by CT in 10%
Calcified Lung Carcinoma Calcium detectable by CT in 10% Usually 2 dystrophic ca++ or
Calcified Lung Carcinoma Calcium detectable by CT in 10% Usually 2 dystrophic ca++ or engulfed granulomatous ca++
Calcified Lung Carcinoma Calcium detectable by CT in 10% Usually 2 dystrophic ca++ or engulfed granulomatous ca++ Most calcified carcinomas are 5cm.+
Calcified Lung Carcinoma Calcium detectable by CT in 10% Usually 2 dystrophic ca++ or engulfed granulomatous ca++ Most calcified carcinomas are 5cm.+ Diffuse, speckled or irregular
Granuloma
Granuloma Usually due to TB or Histo. in Midwest Typically diffuse, laminar or central calcs Typically smooth margins
Calcified Metastases- Osteosarcoma
Criteria for Benignancy Absence of growth over 2+ years* Benign pattern of Ca ++ * Does not apply to sub-solid nodules
ARS #3 60 y/o man who had a previous lobectomy for lung cancer.
ARS #3 60 y/o man who had a previous lobectomy for lung cancer. 8mm
ARS #3 Which of the following would be the most appropriate recommendation : Three to four month CT follow-up One year CT follow-up. PET scan Aspiration needle biopsy Immediate VATs resection 8mm
Recommendations for Follow-up and Management of Small Nodules 1 (Radiology NOV 2005) Nodule Low risk patient 3 High risk patient 4 Size 2 < 4 mm No follow-up needed 5 CT follow-up CT at 12 months; if unchanged, no further follow-up 6 >4-6 mm CT follow-up at 12 months; if unchanged, no further follow-up 6 >6-8 mm Initial CT follow-up at 6 to 12 months, then at 18 to 24 months if no change Initial CT follow-up at 6 to 12 months, then at 18-24 months if no change 6 Initial CT follow-up at 3 to 6 months, then at 12 and 24 months if no change. >8 mm One or more of the following: CT follow-up at 3, 9, 24 months/ Dynamic CT 7 / PET scan / Biopsy
Recommendation for Incidental Subsolid Nodules Adapted from Radiology Jan 2013. Naidich et al. Nodule Type Pure GGN < 5mm Pure GGN > 5mm Recommendations No CT follow-up CT at 3 mos then annually for 3 yrs Part-solid nodule: SC < 5mm Part-solid nodule: SC > 5mm Multiple GGNs < 5mm Multiple GGNs > 5mm without dominant lesion Dominant nodule(s) with solid component CT at 3 mos then annually for 3 yrs+ CT at 3 mos then bx or resection CT at 2 and 4 yrs CT at 3 mos then annually for 3 yrs CT at 3 mos* then bx or resection especially if SC >5mm GGN:Ground glass nodule SC: Solid component
27 y/o woman with lung mass
Carcinoid Tumor
Carcinoid Tumor Neuroendocrine tumors; carcinoid syndrome rare (1-3%)
Carcinoid Tumor Neuroendocrine tumors; carcinoid syndrome rare (1-3%) Majority (80%) in main or segmental bronchi; present with atelectasis/obstructive pneumonia
Carcinoid Tumor Neuroendocrine tumors; carcinoid syndrome rare (1-3%) Majority (80%) in main or segmental bronchi; present with atelectasis/obstructive pneumonia Calcification in 30%
Carcinoid Tumor Neuroendocrine tumors; carcinoid syndrome rare (1-3%) Majority (80%) in main or segmental bronchi; present with atelectasis/obstructive pneumonia Calcification in 30% Atypical carcinoids : 10%
Hamartoma
Hamartoma
Hamartoma Most commonly resected benign tumor Peak incidence in sixth decade Endobronchial in 5% Fat and/or calcium on CT in 50%+ Well-defined, slow growing
Intrapulmonary Lymph Nodes Touching or within 5mm of pleural surface Typically triangular or oval Thin septal connection Usually in lower lungs
Incidental Nodule in 35 year old woman
Pulmonary AVM
AVM
AVM
AVM
AVM
Pulmonary AVM F:M=2:1, all ages Hemoptysis & dyspnea 35% multiple 40% - 65% have HHT (Osler-Weber-Rendu) Mostly lower lobe location
Conclusions Use routine thin sections and reformats to characterize small nodules Learn to recognize suspicious morphology Regard persistent non-solid nodules on CT with high suspicion, even if unchanged over long periods Always compare with earliest available scan to determine growth in subsolid nodules
Mucinous Adenocarcinoma
Mucinous Adenocarcinoma
Adenocarcinoma