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- The most common (80%) cause of non-traumatic subarachnoid hemorrhage (SAH) = ruptured saccular (berry) aneurysm.
- Saccular aneuryms are thought to be present in up to 5% of the population.
- There is a strong familial association with cerebral aneurysms, and prevalence is increased in people with Marfan Syndrome and Polycystic Kidney Disease.
- Other causes of non-traumatic SAH include: AV malformation, cavernous angioma, mycotic aneurysm, and blood dyscrasia.