الفهرس 
Gross and CT Anatomy of the Cerebral ArteriesOnly 14 pages are availabe for public view
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Abstract
Intracranial aneurysm is specifically defined as a dilated
and weakened portion of a cerebral blood vessel. The main
risk associated with intracranial aneurysm is that it may
rupture and cause bleeding within the brain, known as
subarachnoid hemorrhage (SAH).
In a review of the literature, 89% of saccular intracranial
aneurysms were associated with SAH, 7% were associated
with a mass effect, and 4% were incidental findings.
Aneurysms commonly arise at the bifurcations of major
arteries. Most saccular aneurysms arise on the circle of Willis
or the MCA bifurcation. Approximately 86.5% of all
intracranial aneurysms arise on the anterior (carotid)
circulation. About 10% of all intracranial aneurysms arise on
the posterior (vertebrobasilar) circulation.However, the
internal carotid and middle cerebral arteries seem to be prone
to the formation of multiple aneurysms.