# A Rare Tumor Causing Optic and Oculomotor Nerve Compression: Clivus Plasmacytoma Case Report

## TL;DR

A rare case of clivus plasmacytoma caused optic and oculomotor nerve compression in a 64-year-old man, treated with radiotherapy.

## Contribution

Presents a rare case of clivus plasmacytoma with optic and oculomotor nerve involvement.

## Key findings

- Plasmacytoma in the clivus caused ptosis and decreased vision due to nerve compression.
- Radiotherapy was used as the treatment for the tumor.
- The case highlights the importance of considering plasmacytoma in clivus tumor differential diagnosis.

## Abstract

Plasmacytomas rarely affect the skull base and may be found as an isolated lesion or as a part of multiple myeloma. The typical feature of plasmacytomas is aggressive bone destruction in the skull. It is often confused with the chordoma of the clivus. The most common location for skull-base plasmacytomas is the nasopharynx. The most commonly affected cranial nerve in clivus tumors is the abducens nerve. In our 64-year-old male case, a plasmacytoma was detected in the clivus. There was ptosis and decreased vision due to optic nerve and oculomotor nerve involvement due to the plasmacytoma. Radiotherapy was applied for the treatment.