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Herein, we report an extremely rare case of MTX\u2010LPD with peripheral T\u2010cell lymphoma (PTCL) phenotype and lung and skeletal muscle involvement. A 66\u2010year\u2010old man who had received MTX for 8\u2009years for rheumatoid arthritis was admitted for right groin pain. A computed tomography scan revealed masses in the right middle lobe and right psoas muscle and multiple nodules in both lung fields. Pathological and immunohistochemical examinations of a lung nodule and psoas muscle tumor revealed PTCL. Remission was achieved soon after discontinuing MTX.<\/jats:p>","DOI":"10.1155\/carm\/7668419","type":"journal-article","created":{"date-parts":[[2026,1,28]],"date-time":"2026-01-28T11:55:30Z","timestamp":1769601330000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Methotrexate\u2010Associated Lymphoproliferative Disorders Characterized by a T\u2010Cell Phenotype With Lung and Psoas Involvement: A Case 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