Abstract
A 63-year-old Japanese man being treated for pemphigus vulgaris with methotrexate (MTX) presented with a fever of unknown origin. His only symptom at onset was mild gingival swelling. Suspected to have gingivitis, he was followed for 1 month. After that, he presented with cervical lymphadenopathy, dysphagia, and bicytopenia, and a diagnosis of MTX-associated lymphoproliferative disorder (MTX-LPD) was finally made by gingival biopsy. He had spontaneous remission after the withdrawal of MTX. When MTX-treated patients complain of fever and oral lesions, even if the oral lesions present as mild gingival swellings, physicians should consider MTX-LPD and perform a diagnostic biopsy.
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