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Subarachnoid Hemorrhage (SAH)
Occurs when bleeding is present between the layers that cover the brain (subarachnoid space) and can produce stroke symptoms. Most cases of SAH are caused by rupture of an intracranial aneurysm. The primary symptom of aneurysmal subarachnoid hemorrhage is a sudden, severe headache. SAH are the less common type of hemorrhagic strokes.
In non-traumatic settings, rupture of a cerebral aneurysm or ateriovenous malformation may occur and result in a SAH.[16]
According to the National Institute of Neurological Disorders and Stroke, "About 25% of individuals whose cerebral aneurysm has ruptured do not survive the first 24 hours; another 2% die from complications within 6 months. People who experience subarachnoid hemorrhage may have permanent neurological damage. Other individuals recover with little or no disability." [77]
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