Coronary artery-to-pulmonary artery stulae (CAPF) are a not uncommon nding in patients with Tetralogy of Fallot (TOF) and collateral dependent pulmonary blood ow. Management for these stulae is often primary surgical ligation or unifocalization at the time of complete repair, dependent on the presence of dual blood ow to the involved areas. We present the case of a 32-week premature boy weighing 1.79 kg with TOF, con uent branch pulmonary arteries, major aortopulmonary collaterals and right coronary artery to main pulmonary artery stula. The patient demonstrated evidence of coronary

Coronary artery-to-pulmonary artery fistulae (CAPF) are a not uncommon finding in patients with Tetralogy of Fallot (TOF) and collateral dependent pulmonary blood flow. Management for these fistulae is often primary surgical ligation or unifocalization at the time of complete repair, dependent on the presence of dual blood flow to the involved areas. We present the case of a 32-week premature boy weighing 1.79 kg with TOF, confluent branch pulmonary arteries, major aortopulmonary collaterals and right coronary artery to main pulmonary artery fistula. The patient demonstrated evidence of coronary steal into the pulmonary vasculature with an elevation in the troponin level without hemodynamic instability, and subsequently underwent successful trans-catheter occlusion of the fistula via right common carotid access using a Medtronic 3Q microvascular plug. This case demonstrates the realistic potential for early coronary steal in this physiology and possibility of trans-catheter therapy even in a small neonate.