[Abnormal origin of the left coronary artery from the pulmonary artery trunk; a fortuitous discovery in a 52 year-old man].

Anomalous origin of the left coronary artery from the pulmonary artery is a rare congenital abnormality but with a very poor prognosis at birth. Myocardial ischaemia, infarction and sudden death are common. Cases diagnosed in adulthood are exceptionally rare. The authors describe the case of an asymptomatic 52 year old man with this congenital abnormality diagnosed after routine electrocardiography had shown sequellae of anterior myocardial infarction. This case would seem to be one of the rarest cases diagnosed fortuitously at this age. In view of the good clinical tolerance of the disease and the absence of residual ischaemia on effort, the patient was treated medically.