Anomalous great cardiac vein draining into the right atrium combined with a single left coronary artery.

In contrast to the coronary arterial system, little attention has been paid to the coronary venous system in previous literature. We report a rare case of a combined anomaly of the coronary artery and the great cardiac vein (GCV). In this patient, the right coronary artery (RCA) arose from the left coronary artery, and the GCV drained directly into the right atrium. The anomalous RCA and GCV ran parallel courses along the anterior side of the right ventricular outflow tract. We briefly review the clinical significance and the role of cardiac computed tomography in this anomaly.