A chest computed tomography scan. A) The axial view shows the right aortic arch. B) The coronal view shows the right descending aorta in the right thoracic cavity. C) The anterior view of the three-dimensional computed tomography scan shows the right aortic arch with the aberrant left subclavian artery. D) The lateral view shows the so-called “Kommerell diverticulum” of the left subclavian artery. E) The branching of the pulmonary artery, vein, and the bronchi are normal. AAO, ascending aorta; AD, aortic diverticulum; DAO, descending aorta;. LCCA, left common carotid artery; LSA, left subclavian artery; RAO, right aorta; RCCA, right common carotid artery; RSA, right subclavian artery.