Prevalence of saccular cerebral aneurysms in the asymptomatic general population has been reported over a wide range (0.2-8.9%) when examined angiographically, and in 15-30% of these patients, multiple aneurysms are found.

A familial tendency to aneurysms is also well recognised, with patients who have more than one affect first degree relative affected having a 17-44% chance of themselves having an aneurysm.

[[Saccular aneurysm]]s are most common in the [[anterior communicating artery]] (ACoA).