Computed tomography (CT) can be helpful in the detection and diagnosis of aortic arch malformations, including anomalous right subclavian artery, left sided aortic arch with right descending aorta, right sided aorta with anomalous left subclavian artery or mirror image branching and double aortic arch. The CT findings in 10 such patients are reviewed. CT can confirm the presence of an aortic anomaly suspected from plain radiographs or can detect a vascular anomaly when the plain radiograph suggests the presence of a mediastinal mass.