Anomalous origin of the right coronary artery from the pulmonary artery diagnosed as an incidental finding.

A 2-year-old boy was referred for evaluation of a systolic heart murmur. Two-dimensional Doppler echocardiogram showed an abnormal flow through the interventricular septum, directed upward and toward the posterior wall of the main pulmonary artery. Left coronary angiogram showed a normal distribution of the anterior descending and circumflex arteries.