Figure 11

Aberrant right subclavian artery in a 55-year-old woman with an unruptured cerebral aneurysm. a: Arch aortography, frontal view. b: Left anterior oblique view. When the catheter was inserted into the aortic arch, it was found that the patient had an aberrant right subclavian artery with its origin on the left of the trachea. In most cases, the right vertebral artery branches off the right subclavian artery, but it may also branch off the right common carotid artery, as in this patient. Thus, when inserting the catheter into the right common carotid, it is necessary to check for the presence of the vertebral artery and avoid damaging it.