Anomalous origin of the coronary arteries.

The incidence and the clinical significance of various forms of anomalous aortic origin of coronary arteries are not well known. Among 2,000 consecutive patients who underwent selective coronary aretriography, 11 had such anomalies (0.55%). Two patients with atresia of the left main ostia developed ischemic symptoms at the ages of thirty-five and fifty-two, and both benefitted from coronary bypass graft operation. In other forms of anomalies the presence of ischemic symptoms was also associated with atherosclerotic stenosis (7 patients) or with constricting muscle bridge (1 patient).