INFO/WWW: An aneurysm is a dilatation of the wall of an artery or heart - caused by myocardial infarction (MI). Aneurysms of the large arteries are usually due to arteriosclerosis but they can be the result of syphilitic mesoaortitis, infections, cystic media degeneration, Marfan`s syndrome or trauma. A infrarenal (common site) abdominal aortic aneurysm (2,3)is a localized enlargement ot the abominal aorta, distal to the renal arteries. The patients complain about pain in the abdomen, back, groin (because of prolonged pressure on lumbal arteries and the large radicular artery) and feel a strong pulse in the abdomen. Main risk of an aneurysm is rupture.