title: Quadriscupid aortic valve: a rare entity.
authors.forename: Tsung O
authors.initials: TO
authors.lastname: Cheng
mesh_terms: D001021:Aortic Valve / Q000002:abnormalities* / Q000000981:diagnostic imaging; D001022:Aortic Valve Insufficiency / Q000000981:diagnostic imaging*; D017548:Echocardiography, Transesophageal; D006801:Humans