NCIt definition : A rare type of multiple myeloma in which the plasma cells synthesize but do not secrete
immunoglobulins. As a result, none of the immunoglobulins appear out of the normal
range. The symptoms are generally the same with those of immunoglobulin-secreting
myeloma; however, the incidence of renal insufficiency is lower in non-secretory myeloma.
The diagnosis can be missed because of the absence of monoclonal immunoglobulin in
the serum or urine.;