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One\u2010third of the pediatric patients present with symptoms related to the compression of the tumor mass on the surrounding anatomic structures, and paraneoplastic syndromes such as myasthenia gravis, pure red cell aplasia, acquired hypogammaglobulinemia, and connective tissue disorders, which rarely occur in children with thymic tumors. Herein, we report a case of thymic carcinoma mimicking the symptoms of a connective tissue disease with symmetrical polyarthritis accompanying myositis, fever, weight loss, and malaise in a 15\u2010year\u2010old male patient. To our knowledge, this is the first case pediatric thymic carcinoma accompany with severe polyarthritis and myopathy, thus we have reviewed the current literature regarding the cases of thymic malignancies coexisting with paraneoplastic syndromes in children.<\/jats:p>","DOI":"10.1111\/1756-185x.15187","type":"journal-article","created":{"date-parts":[[2024,5,14]],"date-time":"2024-05-14T11:59:34Z","timestamp":1715687974000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Thymic carcinoma presenting with overlap polyarthritis and myositis: A rare paraneoplastic syndrome in childhood"],"prefix":"10.1111","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6901-9944","authenticated-orcid":false,"given":"\u00c7isem","family":"Y\u0131ld\u0131z","sequence":"first","affiliation":[{"name":"Department of Pediatric Rheumatology Gazi University Faculty of Medicine  Ankara 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