Non-Secretory Multiple Myeloma: A New Observation and Review of the Literature.

Non-secreting multiple myeloma is a rare variant of multiple myeloma that affects a relatively young population. It is characterized by the non-secretory nature of malignant plasma cells. The following case report describes the history of a 54-year-old patient with non-secretory myeloma revealed by mechanical and inflammatory low back pain. The bone and neurological involvement, the presence of diffuse osteolytic lesions and the increase in the serum kappa free light chains (FLC) level prompted a myelogram. This finds medullary invasion by dystrophic plasma cells. The absence of detection of complete or incomplete monoclonal immunoglobulin in the blood and urine, as well as the revelation of cytogenetic abnormalities of plasma cells, allows the diagnosis of non-secreting multiple myeloma to be made. This clinical case aims to describe the unusual presentation of this rare form of multiple myeloma.