Anomalous origin of the left coronary artery from the pulmonary artery in an adult.

Anomalous origin of the left coronary artery from the pulmonary artery is a rare, almost universally fatal form of congenital heart disease. A case was diagnosed in a 19 year old woman who had exercise induced syncope and ST segment displacement during exercise stress testing. The anomaly was successfully treated with ligation of the anomalous left coronary artery combined with saphenous vein grafting. Young adults with exercise induced syncope should be examined by exercise stress testing, and if it induces ST segment displacement coronary angiography should be undertaken.