title: Perfusion of collapsed lung in the presence of a pleural effusion.
mesh_terms: D006801:Humans; D008297:Male; D008875:Middle Aged; D010477:Perfusion; D010996:Pleural Effusion / Q000000981:diagnostic imaging*; D001261:Pulmonary Atelectasis / Q000000981:diagnostic imaging*; D011859:Radiography