[Entrapment neuropathy of the tibial nerve by a Baker's cyst: case report].

Entrapment neuropathies of the tibial nerve by Baker's cysts occur infrequently. We present a patient with entrapment neuropathy of the tibial nerve by a Baker's cyst which is preoperatively evaluated by nerve conduction study and magnetic resonance imaging. We present this case with a review of the literatures.