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Etiologies of subarachnoid hemorrhage (SAH). trauma: the most common cause of SAHruptured intracranial aneurysms: 75-80% of spontaneous SAHs cerebral AVMs: 4-5% of cases certain vasculitides that involve the CNS rarely due to tumor cerebral artery dissection (may also be post-traumatic) no cause can be determined in 14-22% .
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1. Subarachinoid Hemorrhage
27. Guglielmi detachable coil (GDC)
30. Basilar tip aneurysm
31. Vasospasm