A 61-year-old woman presented to her physician with fatigue. A complete blood count showed mild normocytic anemia. Serum protein electrophoresis and immunofixation identified an immunoglobulin G k paraprotein (2.1 g/dL). Laboratory values for calcium, blood urea nitrogen, creatinine, and lactate dehydrogenase were normal; no lytic lesions were detected by magnetic resonance imaging. Subsequent ...
