Relapsing IgD Myeloma with Increased Circulating Plasma Cells: Clinical Case Report and Literature Review.

IgD myeloma is a rare subset of multiple myeloma characterized by the production of monoclonal IgD protein. This subset of myeloma generally has a more severe and aggressive clinical course. The case reported here is of a 61-year-old female with recurrent disease complicated by encephalopathy, myalgia, and extensive skeletal involvement.