An aneurysm is an outward bulging, likened to a bubble or balloon, caused by a localized, abnormal, weak spot on a blood vessel wall. Aneurysms may be a result of a hereditary condition or an acquired disease. Aneurysms can also be a nidus (starting point) for clot formation (thrombosis) and embolization. The word is from Greek: ἀνεύρυσμα, aneurysma, 'dilation', from ἀνευρύνειν, aneurynein, 'to dilate'. As an aneurysm increases in size, the risk of rupture increases, leading to uncontrolled bleeding. ...
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