Radiation response of soft-tissue extramedullary plasmacytoma in multiple myeloma-A case report.

We report the case of a 79-year-old female patient previously treated for multiple myeloma that was referred to our hospital due to a growing painless right arm tumor. Imaging and pathology results confirmed the diagnosis of extramedullary plasmacytoma. The patient underwent external beam radiotherapy with complete clinical response at follow-up.