Eleven patients with congenital aortic arch nomalites were evaluated by CT and MR imaging : six patients had a right sided aortic arch with retroesophageal aberrant left subclavian artery ; four patients had a left sided aortic arch with aberrant right subclavian artery ; and one had a double aortic arch. Presenting clinical symptoms were facial edema in one dysphagia and chest pain in two. The remaining eight patients were asymptomatic. Congenital anomalies of the aortic arch and its great vessels could well be evaluated with both CT and MRI. However, MRI demonstrated anomalous vessels more vividly for its multidirectional imaging capability and natural contrast between flowing blood and surrounding soft tissues.