Round atelectasis.
D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D010994:Pleura / Q000000981:diagnostic imaging; D010996:Pleural Effusion / Q000000981:diagnostic imaging; D001261:Pulmonary Atelectasis / Q000000981:diagnostic imaging* / Q000473:pathology; D011859:Radiography