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.
History and exam
Giovanni Grasso, MD, PhD
Department of Clinical Neurosciences
University of Palermo
GG declares that he has no competing interests.
Dr Grasso would like to gratefully acknowledge Dr Michael Chen, the previous contributor to this monograph. MC is an author of a reference cited in this monograph.
Jae H. Choi, MD
Stroke Center/The Neurological Institute
Columbia-Presbyterian Medical Center
JHC declares that he has no competing interests.
Peter Martin, MA, BM BCh, MD, FRCP
PM declares that he has no competing interests.
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