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Introduction: Previously, we reported a relatively rare case of methotrexate-related lymphoproliferative disorder (MTX-LPD) that developed in the lumbar spine. At present, we report the follow-up of that case, presenting with relapse of MTX-LPD.Case Report: The participant was a 75-year-old woman who was diagnosed with MTX-LPD of the lumbar spine and in whom remission was obtained 6 months after discontinuing methotrexate (MTX). At 12 months after remission, elevated levels of soluble interleukin-2 receptor, lymph node swelling on plain computed tomography (CT), and fluorodeoxyglucose uptake on positron emission tomography CT were observed, and recurrent MTX-LPD was diagnosed. Doxorubicin, bleomycin, vinblastine, and dacarbazine therapy was initiated, and partial remission was obtained 6 months later.Conclusion: In MTX-LPD, remission is often achieved following discontinuation of MTX alone; however, some patients do not improve, and some patients relapse, as seen in the present case. Such cases are treated using the standard regimen for the observed histologic subtype. Even after remission has been achieved, strict follow-up observation is needed for MTX-LPD. Furthermore, when signs of recurrence are observed during follow-up, practitioners should endeavor to cooperate with other specialists and act without delay.Keywords: Rheumatoid arthritis, methotrexate, lymphoproliferative disorder, lumbar spine, oncology.

Recurrent Methotrexate-related Lymphoproliferative Disorder of the Lumbar Spine Origin: A Case Report