[IgM multiple myeloma (author's transl)].

A new case of IgM myeloma in a 47-year-old man is reported. Multiple myeloma was diagnosed by serum electrophoresis and immunoelectrophoresis, marrow plasmocytosis and typical skeletal changes by X - Ray the synthesis of the M - component was demonstrated in the plasma cells of the bone marrow by direct immunofluorescence study. A review of literature was done and relation between macroglobulinemia of Waldenström and IgM myeloma was discussed.