[Lumbosacral plexopathy caused by aneurysms of the abdominal aorta].

We report three patients who presented pain in the sciatic-crural region as presenting feature of an aneurysm of the abdominal aorta. The first patient developed a fullblown plexopathy with bad condition due to a large aneurysm of common iliac artery. The remaining two patients had abdominal aneurysms each that manifested as femoral neuropathy in one case and as L5-S1 radiculopathy in the other patient. The mechanism of neural involvement is discussed and those clinical and radiologic findings which may prompt us to think of such etiology in front of painful clinical pictures in this region are emphasized.