page_title: Intracranial aneurysm
section_title: Classification
hierarchical_section_title: Intracranial aneurysm / Classification
caption_attribution_description: Diagram of cerebral aneurysm
context_page_description: 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.
context_section_description: Cerebral aneurysms are classified both by size and shape. Small aneurysms have a diameter of less than 15 mm. Larger aneurysms include those classified as large (15 to 25 mm), giant (25 to 50 mm), and super-giant (over 50 mm).
caption: Diagram of cerebral aneurysm.
exif: {}