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a–c “Duplicated” VA variant. a Injection of the left subclavian artery is remarkable for presence of unopacified inflow at the C6 vertebral level (green arrow), suggesting that another vessel may be contributing to the supply of the more distal cervical VA. b, c Injections of the proximal subclavian contributor show retrograde opacification of the second, direct aortic arch contributor to the distal VA.
