Solitary fibrous tumor (SFT), first reported by Klemperer and Rabin in 19311), is a mesenchymal tumor rarely found in the oral cavity. We report a case of SFT in the lower gingiva.
The patient was a 37-year-old woman with a 15 mm elastic soft mass in the left lower lingual gingiva. We performed tumor resection. Microscopic examination revealed haphazard proliferation of spindle cells and abundant capillary vessels. Immunohistochemically, the tumor cells showed positive staining for CD34 and bcl-2, but negative staining for S-100, desmin, and α-SMA. The tumor was diagnosed as an SFT. The patient had no signs of recurrence or metastasis 17 months later.
