Anomalous origin of the left anterior descending coronary artery from the pulmonary trunk associated with type B interrupted aortic arch.

An extremely rare congenital anomaly of the coronary circulation in a neonate with type B interrupted aortic arch is reported in which the left anterior descending coronary artery arose from the pulmonary trunk and the right and left circumflex coronary arteries from the aorta. An anomalous coronary artery was demonstrated by selective pulmonary angiography and then confirmed at necropsy.