Lumbosacral plexopathy in the third trimester of pregnancy: a report of three cases.

Lumbosacral plexopathy was diagnosed in three patients in the third part of pregnancy. Symptoms started with acute pain in the groin and/or the lower part of the back around 33 weeks amenorrhoea. Neurological symptoms were absent before pregnancy. Denervation activity occurred in the muscles innervated by the upper part of the lumbosacral plexus. The exact etiology is not known although pressure on the plexus by fetal parts may be involved. Recovery may require months but the injury is self-limiting and the prognosis is favourable.