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Case 1. A, Computed tomographic (CT) image of new lung nodule (arrow) that prompted thoracotomy. B and C, Bronchioloalveolar carcinoma of 1 mm showing crowded cuboidal to columnar cells growing along alveolar walls in a lepidic fashion, with cellular stratification, overlapping of nuclei, and coarse nuclear chromatin (hematoxylin and eosin; original magnifications, 20× and 40×).
