title: Four-year-old boy with small right lung? . . . or . . . large left lung?
mesh_terms: D002675:Child, Preschool; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D008297:Male; D011651:Pulmonary Artery / Q000002:abnormalities* / Q000000981:diagnostic imaging; D011859:Radiography; D011877:Radionuclide Imaging