The viewbox. Round atelectasis.
D003937:Diagnosis, Differential; D004653:Empyema / Q000175:diagnosis; D006801:Humans; D008172:Lung Diseases, Fungal / Q000175:diagnosis; D008175:Lung Neoplasms / Q000175:diagnosis; D008297:Male; D008875:Middle Aged; D001261:Pulmonary Atelectasis / Q000000981:diagnostic imaging*; D011859:Radiography