The word aneurysm comes from the Greek word aneurysma which means widening. An aneurysm is, basically, a bulge in an artery. Aneurysms can be congenital, meaning that they are present at birth, or they can occur due to a weakening in the arteries caused by high blood pressure, head trauma or atherosclerosis (blocked arteries).
A cerebral aneurysm is a potential medical emergency and prognosis obviously vastly depends on if the aneurysm has ruptured or not. Most aneurysms only cause noticeable symptoms if they burst.
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