Nontraumatic SAH usually results from the rupture of an abnormal arterial vessel and subsequent bleeding onto the surface of the brain. Ruptured saccular aneurysms of the basal vessels of the brain account for 77% of nontraumatic SAH. Arterio-venous malformations account for another 10% of cases.

Evidence suggests a multifactorial etiology that involves both genetic and acquired factors.

Genetic factors:

Accquired factors:

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Both genetic and environmental factors can increase the risk of cerebral artery aneurysm

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