What causes aneurysm?
Intracerebral aneurysms can result from trauma, infection, or neoplastic disease. Most aneurysms, however, result from a developmental abnormality of the inside lining or intima of an artery with abnormal thinning of the vessel at the site of origin. It appears there may be a genetic predisposition to the development of intracerebral aneurysms; the existence in some families runs as high as 10%, approximately 10 times higher than that found in the general population. There are several other causes of intracerebral aneurysms.
