Epidemiology

Autopsy studies indicate that cerebral aneurysms are fairly common in adults, with a prevalence ranging between 1% and 5%.[2][3] Prevalence of intracranial aneurysms among adults is estimated between 1.0% and 3.2%.[4][5] Therefore, 3 to 12 million Americans harbor intracranial aneurysms. The incidence of reported ruptured aneurysms is about 6 to 7 in every 100,000 people per year.[6]​​

Cerebral aneurysms can occur at any age but are more common in adults than children. Women are approximately 1.6 times more likely to harbor cerebral aneurysms than men.[5]​ Epidemiologic studies show that 7% to 20% of patients with aneurysmal subarachnoid hemorrhage have a first- or second-degree relative with a confirmed intracranial aneurysm.[7]

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