Primary lymphoma of the trigeminal nerve.

Although malignant lymphoma of the central nervous system (CNS) is rarely seen, its frequency is increasing as a result of more common observation of immunocompromised patients. Primary CNS lymphoma arise usually in the white matter of brain and account for only 0.5-1.5% of all primary brain tumours. However, skull base and cranial nerve lymphomas are extremely rare. We present here the third primary lymphoma of the trigeminal nerve in the literature.