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Case Reports |
Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong. jcschim@hku.hk
A patient with longstanding rheumatoid arthritis (RA) developed swelling in a chronically inflamed knee joint while receiving prolonged methotrexate treatment. Magnetic resonance imaging and positron-emission tomography showed soft tissue swelling with intense tracer uptake. Biopsy confirmed high-grade B-cell lymphoma. He developed complete remission with rituximab plus CEOP. The role of chronic inflammation and methotrexate in the pathogenesis of lymphoma in RA was discussed.
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