Waldenström macroglobulinemia is a rare lymphoproliferative disorder, with an estimated 1,500 new cases reported in the United States each year. This malignancy, which accounts for 2% of non-Hodgkin lymphomas, is characterized by lymphoplasmacytic bone marrow infiltration and the presence of serum monoclonal immunoglobulin M (IgM). It is important for health care professionals involved in the care of patients with Waldenström macroglobulinemia to remain up to date in their knowledge of risk stra...