A case of solitary fibrous tumor of the chin

We report a case of solitary fibrous tumor (SFT) of the chin. A 50-year-old female presented to our hospital in August 2010 with swelling of the chin. Magnetic resonance imaging (MRI) showed a well-demarcated, homogenous lesion of the chin, with low signal intensity on T1-weighted images and moderate signal intensity on T2-weighted images. A benign tumor was suspected based on MRI findings, and subsequently, surgical excision was performed under general anesthesia. Histopathological studies showed that the tumor was composed of interstitial collagenous fibers, microvasculature, and proliferating spindle cells that resemble fibroblasts. The tumor cells were distributed irregularly and inhomogeneously. Immunohistochemical studies revealed that the tumor cells showed positive staining for CD34, vimentin, and bcl-2, but negative for CK AE1/AE3, CD99, SMA, and S100 protein. These findings led to the diagnosis of SFT. No recurrence or metastasis had occurred after a follow-up period of 5 years.