title: [2 cases of severe aortic regurgitation caused by congenital bicuspid aortic valve].
mesh_terms: D000328:Adult; D001021:Aortic Valve / Q000002:abnormalities*; D001022:Aortic Valve Insufficiency / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D013902:Radiography, Thoracic; D014463:Ultrasonography