x-ray vision, your link was to a site about *aortic * aneurysm. They arise from very different causes.
Aneurysms in the brain are much different. For one thing, if they are found, prior to bleeding, the person has a much greater chance of returning to a fairly normal life. If the person presents with unconsciousness, a sign of rupture, Their chances of survival drops, and their chance of surviving with any quality of life is close to zero.
There are two main causes of cerebral aneurysms, [and [url=http://content.nejm.org/cgi/content/full/350/17/e15]A-V Malformations.](]Berry Aneurysms[/url)
Berrys tend to recur if the patient survives the first one. Because of the location, they are often undiagnosed until the bleed.
A-V Ms are usually larger, and cause symptoms for a while prior to rupture. The vessels involved will often spasm, which can cause death in itself.