The authors describe the development of disease in a patient with monoclonal immunoglobulin IgM, urticarial morphoeae and intensive pain in the region of the pelvic bones due to osteolysis and osteosclerosis. The combination of these symptoms corresponds with the so-called Schnitzler syndrome which is analyzed in detail in the discussion. The urticarial manifestations diminish only temporarily during corticoid treatment, other drugs have no effect. 2-chlorodeoxyadenosine, the most effective drug in treatment of m. Waldenström, suppressed the skin manifestations temporarily. However, the concentration of monoclonal IgM did not decline even after two cycles and therefore the authors did not proceed with it during subsequent cycles. The severity of urticaria called for a permanent daily dose of Prednisone. The second symptom, bone pain, was however influenced by the administration of pamidronate (Aredia), using an initial dose of 120 mg per month. Now the patient takes a maintenance dose of 60 mg/month. The authors describe the case to draw attention to a rare cause of urticaria and the possibility to treat bone pain with bisphosphonates.

Keywords: Humans; Male; Schnitzler Syndrome /diagnosis/