Waldenstrom's macroglobulinaemia.

Waldenstrom's macroglobulinaemia is a rare form of monoclonal plasma cell dyscrasia in which there is excess production of immunoglobulin M. Clinically the patient has features of hyperviscosity syndrome and the effects of bone marrow replacement by lympho-plasmacytoid cells. We report here two such cases seen within a period of two months.