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(A) Angiogram of the right vertebral artery revealing anterograde flow in the left cervical ICA (black arrowhead) via the odontoid arcade (single white arrowhead) and retrograde flow in the aberrant origin left ascending pharyngeal artery (double white arrowhead). (B) Lateral view of the right vertebral artery angiogram with simultaneous filling of the left cervical ICA via the network described above. ICA, internal carotid artery.
