Anomalous origin of the right coronary artery from the pulmonary artery with aortopulmonary window.

This report describes a rare case of anomalous origin of the right coronary artery from the pulmonary artery associated with a large aortopulmonary window in a 2-month-old boy. The right coronary artery was exposed to systemic pressure and carried fairly well-oxygenated blood to the myocardium. Closure of the aortopulmonary window alone could have caused acute myocardial ischemia.