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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.
aneurysm. A localized dilatation of the walls of a blood vessel, usually an artery, as a result of infection, injury or degeneration. It is filled with fluid or clotted blood. Aneurysms occur in diabetic retinopathy, and retinal veinocclusion leading to haemorrhages and oedema. false aneurysm usually is caused by trauma. In this case, the wall of the blood vessel is ruptured and blood escapes into surrounding tissues and forms a clot. Because of pressure within the clot arising from the heart's contractions, the clot often pulsates against the examiner's hand as does a true aneurysm.