Congenital absence of the azygos vein: a cause for "aortic nipple" enlargement.
D000328:Adult; D001011:Aorta / Q000002:abnormalities*; D001401:Azygos Vein / Q000002:abnormalities*; D006801:Humans; D008297:Male; D013902:Radiography, Thoracic; D012272:Ribs / Q000098:blood supply*; D014057:Tomography, X-Ray Computed