In lymphoplasmacytoid lymphoma which of the following monoclonal immunoglobulin is seen ?: (A) IgA, (B) IgD, (C) IgG, (D) IgM
Answer is D. Waldenstrom macroglobulinaemia is a low grade lymphoplasmacytoid lymphoma associated with an Ig M paraprotein causing clinical features of hyperviscosity syndrome.Reference:Davidson's principles & practice of medicine 22nd edition pg no 1045