IIAs are uncommon, accounting for 2.6% to 6% of all intracranial<unk> s in autopsy studies.
Infectious intracranial aneurysm
Cerebral vasculitis
Intracranial aneurysm
Cerebral atherosclerosis
Cerebral venous sinus thrombosis
Cirsoid aneurysm
Cerebral arteriovenous malformation
Carotid artery dissection