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of California, San Francisco) details the basic concepts and tenets of aneurysm microsurgery, various craniotomies and exposures for successful clipping, and microsurgical anatomy, dissection strategies, and clipping techniques for each of the seven most common aneurysm types: posterior and anterior communicating artery, middle cerebral artery, ophthalmic artery, basilar bifurcation, pericallosal artery, and posterior inferior cerebellar artery aneurysms.
Cervical and cerebral angiography showed the left vertebral artery thrombosed at 2 cm from its origin (Fig 3) and mild diffuse spasm of the right vertebral artery, with reflux into the left vertebral artery up to the C5 level, covering the posterior inferior cerebellar artery territory.
 The posterior inferior cerebellar artery supplies blood to the medulla and the cerebellum.