IgM Multiple Myeloma (not Waldenstrom Macroglobulinemia)

**Semantic type:** Finding

**Definition:** A finding of multiple myeloma in which the heavy chain of the immunoglobulin M is defective. This finding is seen in other lymphocytic/plasmacytic disorders as well, including Waldenstrom macroglobulinemia.

**Synonyms:** - IgM Type Multiple Myeloma (not Waldenstrom Macroglobulinemia)