The American journal of the medical sciences
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Bing-Neel syndrome, a rare neurological complication of Waldenström macroglobulinemia, is caused by the direct infiltration of malignant lymphoplasmacytic cells into the central nervous system. We report a patient who presented with back pain, weakness, lower extremity numbness, and gait disturbance accompanied by immunoglobulin M paraproteinemia and lymphoplasmacytic lymphoma in the bone marrow. ⋯ After chemotherapy, the patient's neurological and radiological findings improved. Magnetic resonance imaging should be considered when the Bing-Neel syndrome diagnosis is unclear.