Cerebral aneurysm

Typically asymptomatic until ruptured, resulting in a subarachnoid hemorrhage.

Head CT usually confirms the diagnosis of subarachnoid hemorrhage, but lumbar puncture is indicated if the CT is negative and suspicion persists.

Cerebral angiogram is the definitive investigation. CT angiography or magnetic resonance angiography may also be used.

Definitive treatment aims to obliterate the aneurysm from the cerebral circulation. Options include endovascular coiling or open surgical clipping.

Screening with noninvasive neuroangiography is recommended for at-risk populations.

A cerebral aneurysm is a focal abnormal dilation of the wall of an artery in the brain. Intracranial aneurysms are most commonly located at branching points of the major arteries at the base of the brain, which course through the subarachnoid space. Cerebral aneurysms can, by nature of their size, compress neighboring nerves or brain tissue or, more devastatingly, rupture and cause significant morbidity and mortality.