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Desmoplastic fibroblastoma (DF) is a rare benign soft tissue with spindle-to-stellate-shaped fibroblasts and myofibroblasts embedded in a prominent collagenous background. DF, mainly affecting subcutaneous and muscle tissue, very rarely occurs in the oral cavity. Hitherto, only one case of DF on the tongue has been reported. Here, we report another case. A 66-year-old woman was referred to our hospital with a mass formation in the tongue. On examination, a well-circumscribed, elastic, soft tumour with normal surface mucosa, measuring 13×12 mm, was observed on the left dorsal surface of her tongue. MRI and ultrasonography confirmed the mass, and a benign tongue tumour was suspected. The tumour was surgically resected under general anaesthesia 1 month later, leading to the histopathological diagnosis of DF. She experienced an uneventful clinical recovery after surgery, with no recurrence noted for more than 1 year postoperatively. [ABSTRACT FROM AUTHOR]