MME and Waldenstrom macroglobulinemia: If this would be the case of primary PCL or WM terminating into PCL, the flow cytometry of cells must show a population that is deficient in B- and T-cell-specific markers such as CD10, CD20, CD5, CD45, and sIgM, but strongly expressing CD38, CD138, and cytoplasmic lambda light chains, while this case was found to express pan B-cell markers, typical of Waldenström's macroglobulinemia.