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| Brain aneurysm ： ウィキペディア英語版 |
Intracranial aneurysm
An intracranial aneurysm (also called cerebral or 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 (basilar, vertebral and posterior communicating arteries) 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.
==Classification==
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).〔http://www.hopkinsmedicine.org/healthlibrary/conditions/nervous_system_disorders/cerebral_aneurysm_85,P08772/〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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