Alveolar adenoma.
This report describes six cases of an unusual pulmonary neoplasm, the alveolar adenoma, that consists of a benign proliferation of alveolar epithelium and septal mesenchyme. The neoplasm presents as a solitary peripheral lesion on chest radiographs, particularly in older patients. It has unique histologic features, which should be distinguished from those of sclerosing hemangioma, lymphangioma, and bronchioloalveolar carcinoma.
D000236:Adenoma / Q000473:pathology* / Q000648:ultrastructure; D006651:Histocytochemistry; D006801:Humans; D007120:Immunochemistry; D008175:Lung Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D008854:Microscopy, Electron; D008875:Middle Aged; D011650:Pulmonary Alveoli / Q000473:pathology / Q000648:ultrastructure