Many patients with unruptured IIA may have no symptoms. In patients who do have symptoms these are often related to rupture of the<unk>  and to its cause. Rupture of an IIA results in subarachnoid hemorrhage, symptoms of which include headache, dizziness, seizures, altered mental status and focal neurological deficits. In contrast to other cerebral<unk> s, large<unk>  size does not increase the chance of rupture. Small IIAs tend to have high rupture rates, while larger IIAs more commonly cause symptoms due to pressure on the surrounding brain tissue.
Infectious intracranial aneurysm
Cerebral vasculitis
Intracranial aneurysm
Cerebral atherosclerosis
Cerebral venous sinus thrombosis
Cirsoid aneurysm
Cerebral arteriovenous malformation
Carotid artery dissection