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Multiple myeloma is a hematologic malignancy due to monoclonal plasma cell proliferation. It is usually confined to the bone marrow, although extramedullary involvement is known to occur in almost any organ system; myelomatous spread to the central nervous system is a rare manifestation of myeloma. Extramedullary disease is thought to be related to hematogenous spread when myeloma cells show decreased cell surface receptor expression, allowing cells to escape from the bone marrow. Disease outside of the bone marrow generally indicates a