title: Congenital quadricuspid aortic valve.
abstract: Two patients with a quadricuspid aortic valve are described, one of them with concomitant juxtaposed coronary orifices facing the right hand facing sinus. The etiology and incidence of this congenital anomaly will be discussed.
authors.affiliation: Department of Thoracic Surgery, University of Groningen, The Netherlands.
authors.forename: M H
authors.initials: MH
authors.lastname: Brouwer
authors.forename: J J
authors.initials: JJ
authors.lastname: de Graaf
authors.forename: T
authors.initials: T
authors.lastname: Ebels
mesh_terms: D000328:Adult; D001021:Aortic Valve / Q000002:abnormalities* / Q000601:surgery; D001022:Aortic Valve Insufficiency / Q000209:etiology / Q000601:surgery; D003330:Coronary Vessel Anomalies / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male