Anomalous origin of left main cononary artery from anterior sinus of Valsalva with myocardial infarction.

The origin of the left main coronary artery, or its branches, from the right or anterior sinus of Valsalva is a recognized congenital anomaly. The origin of the entire left main coronary artery from a separate ostium in the right sinus of Valsalva and its course to the right and behind the ascending aorta, in a living patient without associated congenital heart disease, has not been described. This anomaly was recognized as the cause of an anterior myocardial infarction in a 12-year-old girl, and it is the subject of this case report.