Right aortic arch with isolation of the left subclavian artery.

A 5-year-old boy with cyanotic heart disease and weak pulses in the left arm is described. Cardiac catheterization and cineangiography confirmed the diagnosis of tetralogy of Fallot and right aortic arch with isolation of the left subclavian artery. In addition to the aortogram and right ventricular cineangiography, pulmonary angiography was performed, demonstrating that blood did not reach the left subclavian artery through a left ductus arteriosus.