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a CTA (VRT 3D reconstructions) shows a vessel connecting the ICA with the basilar artery (annotations). b Axial CT image at the level of the hypoglossal canal shows an enlarged vessel piercing the skull base on the left, through the hypoglassal canal, which was also enlarged (black arrow). c CTA (VRT 3D reconstructions) reveals an absent proximal vertebral artery and hypoplastic contralateral vertebral artery (annotations)
