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Magnetic resonance imaging (MRI) on day 2 showed an acute left cerebellar infarct involving the posterior inferior cerebellar artery and the anterior inferior cerebellar artery territories with hydrocephalus and pneumoventricle (Figure 1b, 1c, 1d).
Other sequelae include downstream embolisation of a thrombus, anterior spinal artery compromise causing spinal cord ischaemia, and occlusion of blood flow to the posterior inferior cerebellar artery (PICA), causing lateral medullary syndrome.
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.
 The posterior inferior cerebellar artery supplies blood to the medulla and the cerebellum.