a single coronary artery with left circumflex artery crossing right ventricular outflow tract in tetralogy of fallot with absent left pulmonary artery

Tetralogy of fallot (tof) with unilateral absence of pulmonary artery and the anomalous coronary artery is a rare combination. detailed preoperative evaluation of coronary artery anatomy is must to prevent injury to the major vessels crossing right ventricular outflow tract. we report a rare association of single coronary artery with left circumflex artery crossing right ventricular outflow tract close to the pulmonary annulus in tetralogy of fallot with absent left pulmonary artery in 11-year-old girl. though there is a great diversity of coronary anomalies in tetralogy of fallot, the prepulmonic course of left circumflex artery crossing the right ventricular outflow tract (rvot) close to the pulmonary annulus has rarely been described in the literature. the patient underwent successful primary single lung intracardiac repair. right ventricular outflow tract obstruction was treated by handmade valved pericardial autologous conduit and release of the tethering of hypoplastic native unicuspid pulmonary valve leaflet maintaining its integrity.