Single coronary artery from the right sinus of Valsalva: angiography, anatomy, and clinical significance.

A case of single coronary artery from the right sinus of Valsalva with a connecting branch passing between the aorta and right ventricular infundibulum is described. The anomaly was demonstrated at coronary arteriography and verified at surgery. This type of single coronary artery has been associated with sudden exertional death in young persons. The case prompted a review of the classification of single coronary artery with emphasis on clinical significance of the various subtypes and angiographic findings.