Crossed pulmonary arteries in conjunction with tetralogy of Fallot.

Crossed pulmonary arteries are an uncommon anomaly in which the left pulmonary artery originates superiorly and to the right of the right pulmonary artery, and the two pulmonary arteries cross each other. This anomaly may accompany other cardiac anomalies. We encountered this anomaly during echocardiographic examination of a 21-month-old boy. He had mesocardia, tetralogy of Fallot, right aortic arch, and malposition of the branch pulmonary arteries. Cardiac angiography confirmed intracardiac anomalies and showed the ostium of the left pulmonary artery lying superiorly and to the right of the right pulmonary artery and their crisscross.