Aneurysms of the visceral and renal arteries.

Visceral aneurysms represent a rare clinical entity; however, 10-20% will rupture and this is accompanied by a significant mortality rate of 20-70%, depending on the location of the aneurysm. The incidence, pathogenesis and clinical aspects of splanchnic and renal artery aneurysms are reviewed from the available literature and the problems of diagnosis and treatment are discussed. Their incidence is increasing and controversy still exists regarding their treatment. The decision for intervention has to take into account the size and the natural history of the lesion, the risk of rupture, which is high during pregnancy, and the relative risk of surgical or radiological intervention. For most asymptomatic aneurysms, expectant treatment is acceptable. For large, symptomatic or aneurysms with a high risk of rupture, surgery is advisable. An alternative treatment is the use of endovascular techniques, ie embolisation, or graft stent insertion.