Plasma cell disorders include monoclonal gammopathies of unknown significance, multiple myeloma, plasmacytoma, Waldenstrom's macroglobulinemia, and amyloidosis. This group of neoplastic diseases involves proliferation of a single clone of plasma cells, producing a monoclonal immunoglobulin protein or immunoglobulin fragment (M protein) that can be identified as a spike on electrophoresis of serum or urine. Plasma cell disorders are associated with a wide spectrum of neurological complications. The pathophysiology, diagnosis, and management of these neurological complications are the subject of this review.
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