Ischemia or infarctions of the brain

Ischemia or infarctions: - raised intracranial pressure; - embolisation from vascular dissection; - direct mass effect on cerebral vessels from brain herniation or overlying extra-axial lesion - Acute reduction in cerebral blood flow; - hypoxia from respiratory arrest or status epilepticus ACA infarction: subfalcine herniation PCA infarction from uncal herniation; Posterior inferior communicating artery from tonsillar herniation Watershed infarcts - Globally reduced cerebral perfusion http://radiopaedia.org/articles/posterior-inferior-cerebellar-artery