Cardiac Arrest in an Adolescent Boy Due to the Anomalous Origin of the Left Main Coronary Artery: Emergency Department Perspective.

Congenital anomalies of the origin of the coronary arteries are rare. Multiple anomalies have been reported where the common one is left circumflex arising from the right sinus of Valsalva (RSV). Other anomalies are a single coronary artery from the left sinus of Valsalva, both coronary arteries originating from RSV, and the left anterior descending from RSV.