title: Superior mediastinal mass.
mesh_terms: D000368:Aged; D001401:Azygos Vein / Q000002:abnormalities* / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008477:Mediastinal Diseases / Q000000981:diagnostic imaging*; D011859:Radiography; D014682:Vena Cava, Inferior / Q000002:abnormalities* / Q000196:embryology