We present the case of a newborn with tetralogy of Fallot and pulmonary atresia, with a right pulmonary artery from the ascending aorta, and a left pulmonary artery arising from the right coronary artery via an indirect aortopulmonary collateral. The embryogenesis of this unusual combination of pulmonary blood supply has significant implications when considering normal migration of the aortopulmonary septum.
Keywords: aortic arches.