[Multiple myeloma with a solitary osteosclerotic legion on seventh cervical vertebra].

The osseous manifestation of multiple myeloma is well known as the osteolytic or osteoporotic feature. On the other hand, there are rare cases of general osteosclerotic manifestation as myeloma variants. We report a case of multiple myeloma with solitary osteosclerotic legion in the cervical vertebra. A 60-year-old-man was admitted with paralysis of both arms. The cervical roentogenogram showed the osteosclerotic change of the seventh cervical vertebra. The pathological study of surgical bone biopsy from the vertebra revealed osseous and severe fibrotic change and accumulation of plasma cells in the residual bone marrow. Clusters of plasma cells were also observed in the bone marrow of ileac bone. In addition, IgG-lambda type M protein was seen in the serum. Therefore we diagnosed this case as the osteosclerotic multiple myeloma. We then analyzed the cytokines known to influence bone formation, and found that the bone marrow serum TGF-beta and PDGF levels were increased compared with normal control. These results may suggest that the preferential increase of osteosclerotic cytokines caused the osteosclerotic changes of bone marrow.