Malignant granular cell tumor mimicking herniated nucleus pulposus.

Peripheral nerve tumors may arise in any nerve, large or small. Their presence is readily apparent when they are superficial, but when they are located in a deep nerve, symptoms can mimic+ the nerve root pain of herniated nucleus pulposus. This case of malignant granular cell tumor, probably of Schwann cell origin, involved the sciatic and tibial nerves in the popliteal fossa.