“…In contrast to systemic nonHodgkin lymphoma, PCNSL is not known to be associated with a monoclonal paraproteinaemia. However, Celik et al [6] have reported a case of PCNSL presenting with a multiple-myeloma-like clinical picture. We have also found in the literature 3 cases of PCNSL associated with an IgM paraproteinaemic neuropathy [7][8][9].…”