Lumbosacral plexopathy secondary to internal iliac artery aneurysm: case report and review of literature

Iliac artery aneurysms are usually asymptomatic and can manifest symptoms only when there is compression, erosion, or trauma present. We report an internal iliac artery aneurysm causing lumbosacral plexopathy developed post hernia repair surgery presenting with right lower limb weakness and numbness. Through imaging and physical exam, traction injury and ischemic processes were ruled out as potential causes of the right lower limb weakness and neuropathy. In patients with unexplained lower extremity weakness and numbness, an iliac artery aneurysm compressing the lumbosacral plexus should be considered and further imaging of the pelvis to look for compressive etiologies of the plexus can be done.