title: Round atelectasis: another pulmonary pseudotumor.
abstract: Round atelectasis is a relatively rare form of collapse, associated with pleural thickening, pleural effusions, or pleural plaques. The mass is always in a subpleural location and has a characteristic comet-tail-shaped structure. Recognition of this entity can avert more invasive procedures.
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D001261:Pulmonary Atelectasis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D011859:Radiography