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proatlantal

Segmental agenesis of right vertebral artery
Figure:  1:  MR  non  contrast  angiogram  showing  (a) Right subclavian  artery  (b)  Right  vertebral  artery  arising  from right subclavian artery (c) Right vertebral artery terminating blindly at C2 vertebra (d) Left vertebral artery arising from left subclavian artery (e) Left subclavian artery.