The prevalence of<unk>  is about 1–5% (10 million to 12 million persons in the United States) and the incidence is 1 per 10,000 persons per year in the United States (approximately 27,000), with 30- to 60-year-olds being the age group most affected.<unk> s occur more in women, by a ratio of 3 to 2, and are rarely seen in pediatric populations.
Intracranial aneurysm
Infectious intracranial aneurysm
Subarachnoid hemorrhage
Cerebral vasculitis
Cerebral atherosclerosis
Cerebral infarction
Intracranial hemorrhage
Carotid artery dissection