Assertion: ischemic stroke | /r/AtLocation | the background of alterations
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Source sentences:
text: Hemorrhagic strokes may occur on the background of alterations to the blood vessels in the brain, such as cerebral amyloid angiopathy, cerebral arteriovenous malformation and an intracranial aneurysm, which can cause intraparenchymal or subarachnoid hemorrhage.[citation needed]