Fig. 2
From: Enlarging pulmonary cyst: a rare form of alveolar adenoma
Microscopic appearance of the resected cyst: (A) low-power view (12.5×, haematoxylin and eosin (H&E) stain; (B) tiny compartmental spaces in cyst wall lined by bland, flattened to cuboidal cells (200×, H&E); (C, D) cellular positivity for pancytokeratin (C) and thyroid transcription factor-1 (TTF-1) (D) (200×); and (E, F) confirmed bronchiolar connection to the cystic lesion (12.5× and 100×, respectively; H&E stain)