Anomalous origin of the right vertebral artery: Review of the literature and case report of right vertebral artery origin distal to the left subclavian artery

We present the case of a 57-year-old patient who was admitted to the hospit al for preoperative cerebral angiography because of an intraspinal mass at the level of C1 and C2. Angiographic examination revealed an abnormal origi n of the right vertebral artery, which normally originates from the right s ubclavian artery. Thus, the right vertebral artery was the last branch of t he supraaortic vessels, We also review herein the incidence of the various anomalous origins of the right vertebral artery in the literature and discu ss their potential embryologic development and clinical significance,