Mortality of IIA is high, unruptured IIA are associated with a mortality reaching 30%, while ruptured IIA has a mortality of up to 80%. IIAs caused by fungal<unk>  have a worse prognosis than those caused by bacterial infection.
Infectious intracranial aneurysm
Cerebral vasculitis
Intracranial aneurysm
Cerebral atherosclerosis
Cerebral venous sinus thrombosis
Cirsoid aneurysm
Cerebral arteriovenous malformation
Carotid artery dissection