Intradural extramedullary solitary plasmacytoma originating in the cervical spine in the setting of refractory multiple myeloma: illustrative case

SP should be included in the differential diagnosis for intradural extramedullary lesions found in the spine, particularly in patients with a history of MM and tumor resistance to radiotherapy. Despite plasmacytoma's classically radiosensitive nature, it is possible to have residual tumor after radiation therapy. In these cases, patients may benefit greatly from surgical biopsy and decompression followed by adjuvant radiotherapy. https://thejns.org/doi/10.3171/CASE24731.