[Plasmocytoma of the skull base revealing multiple myeloma]. / Plasmocytome de la base du crâne révélant un myélome multiple.

We report a case of sphenoidal plasmocytoma in a 57-year-old male revealing multiple myeloma. MRI showed a tumor located in the sphenoid sinus with local extension. Diagnosis was made by histology after transsphenoidal resection. We discuss the imaging features of plasmocytomas and review the principal differential diagnoses.