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Btrain Aneurysm Essay Preview: Btrain Aneurysm Report this essay An aneurysm is a bulge or sac formed by the ballooning of the wall of an artery or a vein (Aneurysm). Aneurysms can be very fatal if ruptured. Approximately 20,000 aneurysms rupture each year. Mostly women are affected by brain aneurysms. Many people do not know.