title: Multiple chronic benign pulmonary nodules.
abstract: Four cases are discussed in which were found unusual multiple chronic pulmonary nodules: leiomyomatous hamartomas, rheumatoid nodules, multiple histoplasmomas, and possible multiple plasma cell granulomas (hyalinizing pulmonary nodules). In each case the initial impression of metastic malignancy was countered by more than 2 years' observation, during which time the lesions appeared to be benign. Histologic examination is necessary to exclude malignancy, although a definitive diagnosis may be difficult to establish.
mesh_terms: D000328:Adult; D002908:Chronic Disease; D005260:Female; D006099:Granuloma / Q000000981:diagnostic imaging; D006660:Histoplasmosis / Q000000981:diagnostic imaging; D006801:Humans; D007889:Leiomyoma / Q000000981:diagnostic imaging; D008171:Lung Diseases / Q000000981:diagnostic imaging*; D008172:Lung Diseases, Fungal / Q000000981:diagnostic imaging; D008175:Lung Neoplasms / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D011859:Radiography; D012218:Rheumatoid Nodule / Q000000981:diagnostic imaging