Neurolymphomatosis of the Sciatic and Tibial Nerves.

Neurolymphomatosis (NL) is an uncommon clinical condition, characterised by lymphomatous infiltration of the central and/or peripheral nervous system. Most often it is caused by B-cell non-Hodgkin's lymphoma (NHL). Clinically, patients usually present with neuropathy involving the nerve roots, plexuses, peripheral or cranial nerves. NL usually occurs as a complication of prior lymphoma, but it can also present in the form of relapsed lymphoma. It is important to diagnose and start early treatment in all cases of nodal or visceral (including neural) lymphoma with chemo and/or radiation therapy. The PET-CT and MRI can help in making diagnosis. We are presenting a case of 28-year male patient, diagnosed as diffuse large B-cell lymphoma on the background of follicular lymphoma, which initially responded to treatment but then presented with NL, based on clinical history and radiological findings which were confirmed by histopathology.