title: Letter: Quadricuspid aortic valve.
mesh_terms: D000328:Adult; D001021:Aortic Valve / Q000002:abnormalities*; D001022:Aortic Valve Insufficiency / Q000209:etiology / Q000601:surgery; D005260:Female; D006330:Heart Defects, Congenital / Q000000981:diagnostic imaging / Q000601:surgery; D006350:Heart Valve Prosthesis; D006801:Humans; D011859:Radiography