A 72-year-old woman with an aberrant right subclavian artery (ARSA) with an inferoposterior origin (case 15). A : Anterior view of the aortic arch branch showing separate origin of both common carotid arteries (CCAs) and the left vertebral artery (VA) from the aorta (red arrow, left VA originating from the aortic arch; yellow arrow, left subclavian artery; white arrow, left CCA; blue arrow, right CCA; gray arrow, right subclavian artery). B : Posterior view of the aortic arch branch showing the ARSA (gray arrow, ARSA; red arrowhead, Kommerell diverticulum). C : Axial image showing the ARSA located anterior to the thoracic vertebrae (yellow arrow, aorta; red arrow, trachea; black arrow, esophagus; blue arrow, ARSA). D : Coronal image showing the ARSA with a horizontal course anterior to the vertebral body and an ascending course to the right side of the vertebral body (red arrow, ARSA; yellow arrow, second thoracic vertebral body).