Newborn with decreased pulses in the lower extremities 3D CT with contrast of the aorta viewed posteriorly (left) shows diffuse narrowing of the aortic arch until its junction with the descending aorta. 3D CT viewed anteriorly (right) shows a huge patent ductus arteriosus joining into the descending aorta. The diagnosis was coarctation of the aorta that was preductal and thus ductal dependent.