[Anomalous left main coronary artery with an inter-aorto-pulmonary trajectory: diagnostic value of 64-slice CT scan with cardiac synchronisation]. / Anomalie de naissance du tronc coronaire gauche avec un trajet interaortopulmonaire: apport du scanner 64 coupes avec synchronisation cardiaque.

Anomalous left coronary artery arising from the right sinus with an inter-aorto-pulmonary trajectory is a classical cause of sudden death and myocardial ischaemia in young adults. The mechanism is compression of the coronary during physiological dilatation of the great arteries on exercise. The authors report the case of a 12 year old child who had syncope on effort preceded by angina due to this malformation. The CT scan with 3-D reconstruction confirmed the diagnosis and the interarterial trajectory of the left coronary artery and the anatomical relationships with the vessels at the base of the heart. Cardiac CT scan is the investigation of choice for diagnosis and preoperative work-up of congenital coronary anomalies. In the authors' experience, the investigation is performed systematically when an anomalous coronary artery is suspected, in addition to echocardiography and instead of conventional coronary angiography.