Congenital malformation where the AORTIC VALVE has four instead of three cusps. It is often associated with AORTIC REGURGITATION and AORTIC VALVE STENOSIS.

Synonyms: Aortic Valve, Quadricuspid Quadricuspid Aortic Valve Disease Quadricuspid Aortic Valve Disorder Quadricuspid Aortic Valvular Disease Quadricuspid Aortic Valve Quadricuspid Aortic Valves Congenital Quadricuspid Aortic Valve Quadricuspid Aortic Valve Condition