Multiple Cranial Nerve Involvement as a Presentation of Primary Central Nervous System Lymphoma: A Case-Based Review.

Central nervous system (CNS) lymphoma is of two types: primary and secondary (more common). Primary CNS lymphoma usually presents as parenchymal lesions having characteristic imaging findings and may be associated with leptomeningeal involvement. Involvement of multiple cranial nerves as the initial manifestation of primary CNS lymphoma with the development of typical parenchymal lesions on follow-up is a rare entity. This nerve involvement is termed as neurolymphomatosis. We present the magnetic resonance imaging features of five patients presenting with neurolymphomatosis due to non-Hodgkin's lymphoma.