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An aneurysm or aneurism (from Greek: á¼Î½ÎµÏÏÏÏÎ¼Î±, aneurysma, dilation, from á¼Î½ÎµÏÏÏÎ½ÎµÎ¹Î½, aneurynein, to dilate) is a localized, blood-filled balloon-like bulge in the wall of a blood vessel.n aneurysm or aneurism (from Greek: á¼Î½ÎµÏÏÏÏÎ¼Î±, aneurysma, dilation, from á¼Î½ÎµÏÏÏÎ½ÎµÎ¹Î½, aneurynein, to dilate) is a localized, blood-filled balloon-like bulge in the wall of a blood vessel.
The word aneurysm comes from the Latin word aneurysma, which means dilatation. Aneurysm is an abnormal local dilatation in the wall of a blood vessel, usually an artery, due to a defect, disease, or injury. Aneurysms can be true or false. A false aneurysm is a cavity lined by blood clot.The 3 major types of true intracranial aneurysms are saccular, fusiform, and dissecting.hown here is a CT scan of an aneurysmal subarachnoid hemorrhage. The CT scan in a 55-year-old woman shows subarachnoid blood within the interpeduncular and ambient cisterns and the right sylvian fissure caused by a ruptured aneurysm at the junction of the right carotid artery and the posterior communicating artery.