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Injection in the left vertebral artery, with retrograde flow in the contralateral vertebral artery, the basilar artery and the posterior communicating artery. The posterior cerebral circulation can be seen, including the posterior part of the arterial circle of Willis.
Wikimedia Commons Diagram of the basilar artery and circle of willis.This diagram has been reproduced from Gray's Anatomy 20th US edition which has now lapsed into the public domain (http://en.wikipedia.org/wiki/Image:Circle_of_Willis_en.svg)