A 3 year old girl with cyanotic congenital heart disease had ventricular septal defect and pulmonary atresia. The arterial saturation was 76%. Confluent central pulmonary arteries were seen from suprasternal view on echocardiography, but the origin was not clear. A cardiac catheterisation to delineate the details of pulmonary artery anatomy showed two small major aortopulmonary collaterals supplying …