Quadricuspid aortic valve with severe aortic regurgitation.

Quadricuspid aortic valve is a rare congenital anomaly that usually presents with aortic regurgitation. Its importance, however, lies in its association with coronary abnormalities, which may lead to surgical catastrophe, if not diagnosed pre-operatively. This report describes a case of quadricuspid aortic valve detected incidentally during routine pre-operative transesophageal echocardiography.