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What is an Aneurysm?

A dangerous swelling on an artery, liable to burst. The common sites for aneurysm formation are on the aorta the largest artery in the body and on the small arteries under the base of the brain that supply the blood to it. The former are usually caused by atherosclerosis, the latter by a congenital weakness of the vessel wall.

Angiograph of an aneurysm in a cerebral artery.

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