Morbidity associated with anomalous origin of the left circumflex coronary artery from the right aortic sinus.

Anomalous origin of the left circumflex (LC) coronary artery from the right sinus of Valsalva is the most common coronary anomaly and, generally, is considered to be benign.Nevertheless, myocardial infarction or sudden death in young patients with this coronary anomaly has infrequently been described.We report 2 cases of anomalous origin of the LC coronary artery from right aortic sinus, free of atherosclerotic obstructive lesions, presenting clinically with either myocardial infarction or effort angina.