[Complete occlusion at the origin of the common trunk of the left coronary artery with intercoronary and aorto-coronary anastomotic circle: description of a case].

We describe the case of a patient with unstable angina and left main coronary artery occlusion, yet with good collateral circulation from the right coronary artery, and with normal left ventricular function. We identified an anomalous vessel from the ascending aorta ensuring a good supply to the left coronary artery.