Single collateral artery from descending thoracic aorta supplying pulmonary circulation-Computed tomography and echocardiographic images.

Pulmonary atresia (PA) with ventricular septal defect (VSD) is a rare congenital cardiac anomaly in which the pulmonary blood flow is supplied by major aorta pulmonary collateral arteries (MAPCAs). The complete repair includes unifocalization of MAPCAs, closure of VSD, and placement of a right ventricle-to-pulmonary artery conduit. We report a case of VSD with PA, where the computed tomography and echocardiography images described a large single collateral artery arising from descending thoracic aorta dividing into left and right branches and supplying the entire pulmonary circulation.