Quadricuspid Aortic Valve With Guarded Left Coronary Artery Ostium in an Infant With Myocardial Infarction.

• Anatomical variations of the aortic valve include unicuspid, bicuspid, and quadricuspid. • The bicuspid aortic valve is most common and affects 1%-2% of the general population. • QAV is generally an isolated malformation, and adults most commonly present with AR.