A<unk>  (QAV) is a rare congenital heart defect characterized by the presence of four cusps, instead of the usual three found normally in the aortic valve. It is a defect that occurs during embryological development of the aortic trunk during gestation. There is an increased risk of developing post-natal aortic regurgitations and other heart-related diseases; therefore patients with the condition should be carefully monitored.
Quadricuspid aortic valve
Bicuspid aortic valve
Flutter valve
Mitral annular calcification
Supravalvular aortic stenosis
Accessory auricle
Overriding aorta
Mitral annular disjunction