plasma cell dyscrasia

plas·ma cell dys·cra·si·a

A diverse group of diseases characterized by the proliferation of a single clone of cells producing a monoclonal immunoglobulin or immunoglobulin fragment (a serum M component). The cells usually have plasma cell morphology, but may have lymphocytic or lymphoplasmacytic morphology. This group includes multiple myeloma, Waldenström macroglobulinemia, the heavy chain disease, benign monoclonal gammopathy, and immunocytic amyloidosis.

plasma cell dyscrasia

A lymphoproliferative disorder characterized by monoclonal proliferation of plasma cells, with clinical behavior ranging from innocuous extramedullary plasmacytomas to premalignant solitary plasmacytoma of bone to myeloma. Cf Monoclonal gammopathy of undetermined significance, Myeloma.