15 Top Brain Aneurysm . 31,879 likes · 687 talking about this · 353 were here. An intracranial aneurysm, also known as a 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. Brain aneurysms range in size, with some being small (millimeters) and some quite large brain aneurysms generally affect adults over the age of 30. Risks, symptoms, early detection, treatment, recovery and the brain aneurysm foundation. Links brain aneurysm foundation www.brainaneurysm.com.