Single coronary artery, anomalous origin of the right coronary artery from the left anterior descending artery

We present a patient with an abnormal origin of the right coronaryartery from the left anterior descending artery. The patienthad chest pain probably related to myocardial ischaemia. Thisanomaly is very rare and has previously been reported in onlythree cases. The abnormal vessel travelled rightwards and remainedanterior to the main pulmonary artery, it was free of significantstenosis. The mechanism of anterior myocardial ischaemia remainsunexplained.