Magnetic resonance angiogram showing a right pulmonary artery (RPA) arising from the patent ductus arteriosus (PDA) and discontinuous from the left pulmonary artery in a patient with tetralogy of Fallot and pulmonary atresia. Magnetic resonance angiogram showing a right pulmonary artery (RPA) arising from the patent ductus arteriosus (PDA) and discontinuous from the left pulmonary artery in a patient with tetralogy of Fallot and pulmonary atresia. Dipankar Gupta, and Arun Chandran Neoreviews 2015;16:e362-e377 ©2015 by American Academy of Pediatrics