An<unk> , also known as a brain<unk> , 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.<unk> s in the posterior circulation (basilar artery, vertebral arteries and posterior communicating artery) have a higher risk of rupture. Basilar artery<unk> s represent only 3–5% of all<unk> s but are the most common<unk> s in the posterior circulation.
Intracranial aneurysm
Infectious intracranial aneurysm
Subarachnoid hemorrhage
Cerebral vasculitis
Cerebral atherosclerosis
Cerebral infarction
Intracranial hemorrhage
Carotid artery dissection