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AORTIC ARCH VARIANT AND COMMON CAROTID ARTERY AGENESIS.

An 83-year-old woman with a history of ileocecal appendix cancer underwent a staging thoracic-abdominal-pelvic computed tomography. Two extremely rare anatomic variants were identified: the right vertebral artery presented an anomalous origin from the aortic arch distal to the left subclavian artery and a retro-esophageal course; right common carotid artery agenesis.