Diagnostic Challenges of Anomalous Left Coronary Artery from the Right Pulmonary Artery.

• ALCAPA is a rare congenital heart defect seen in about one in 300,000 live births. • ALCARPA is an even rarer subset of ALCAPA with the LCA originating from the RPA. • Few cases report ALCARPA associated with coarctation of the aorta. • Coarctation and VSD may cause PH with antegrade LCA flow. • These defects are hard to diagnose and require coronary imaging before surgery.