An Unusual Culprit: Syncope in an Adolescent With Congenital Left Main Coronary Artery Atresia.

There are fewer than 100 reported cases of congenital left main coronary artery atresia. In this report, we present an adolescent male presenting with exertional syncope in the setting of this rare coronary defect, and review important diagnostic and therapeutic considerations imperative to obtain a favorable outcome.