A 66-year-old woman presented with history of syncope, and physical signs of aortic stenosis. Echocardiography showed severe calcific aortic stenosis. Preoperative coronary arteriography revealed a double right coronary artery. Injection in the right coronary orifice resulted in selective opactfication of 2 different right coronary arteries arising separately from this sinus and coursing down the right atrioventricular groove. Neither a double right coronary orifice nor a right main trunk could be shown by arteriography. After the origin of a corms artery and a ventricular branch, the most anterior right coronary artery (Figure IA) descended toward the acute margin of the heart and terminated in a small posterior descending artery. The second right coronary artery (Figure 1B) ends with a small posterior descending artery and posterolateral branches.