Anomalous origin of the right coronary artery arising from the circumflex artery.

A case of anomalous origin of the right coronary artery discovered among 3100 selective coronary arteriograms is described. This artery was arising from the circumflex artery. The position, distribution, and configuration of this coronary artery was as a normal right coronary artery, except that its origin was in the peripheral segment of the circumflex artery. This anomalous origin is very rare and seems not to give rise to any clinical significance.