How common are brain aneurysms?

A cerebral aneurysm is a thin or weak spot that can occur on a blood vessel of the brain. The aneurysm causes that area of the vessel to enlarge and fill with blood. As a result, the blood vessel may begin to bulge and put stress on nerves or surrounding brain tissue. read more

Intracranial aneurysm, also known as brain aneurysm, is a cerebrovascular disorder in which weakness in the wall of a cerebral artery or vein causes a localized dilation or ballooning of the blood vessel. Aneurysms in the posterior circulation have a higher risk of rupture. Basilar artery aneurysms represent only 3%-5% of all intracranial aneurysms but are the most common aneurysms in the posterior circulation. read more

The causes of brain aneurysm are unknown, but a range of factors may increase your risk. Risk factors. A number of factors can contribute to weakness in an artery wall and increase the risk of a brain aneurysm or aneurysm rupture. Brain aneurysms are more common in adults than in children and more common in women than in men. read more