Monoclonal gammopathy of undetermined significance (MGUS)

Premalignant, clonal plasma cell disorder, characterized by the presence of a monoclonal (M) protein, <10% clonal plasma cells in the bone marrow, and absence of multiple myeloma or related lymphoplasmacytic malignancies (LPMs).

Plasma cell dyscrasias (PCDs)

Spectrum of progressively more severe monoclonal gammopathies characterized by the expansion of a population of monoclonal bone-marrow plasma cells that produce monoclonal immunoglobulins.