Case report identifies periarticular lymphoproliferative disorder mimicking knee synovitis in RA patients, suggesting critical considerations in treatment.
Other iatrogenic immunodeficiency-associated lymphoproliferative disorders (OIIA-LPDs) develop in patients with rheumatoid arthritis (RA) during treatment with disease-modifying antirheumatic drugs (DMARDs). Periarticular OIIA-LPDs are rare and poorly understood. An 81-year-old woman with RA presented with knee swelling, a fever, and weight loss. Imaging studies revealed bone erosion and a 18F-fluorodeoxyglucose uptake around the knees. A histopathological analysis was consistent with diffuse large B-cell lymphoma, confirming the diagnosis of OIIA-LPD. Discontinuation of DMARDs resolved the knee swelling and prevented further bone erosion. This report highlights the importance of considering OIIA-LPDs in patients with RA, atypical joint swelling, and systemic symptoms.
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Hirose et al. (2025) studied this question.
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