Solitary Fibrous Tumor in the Buccal Space: MR Findings with Pathologic Correlation

Summary: We report MR findings in a case of a solitary fibrous tumor involving the buccal space in a middle-aged man. On MR images, most of the mass was isointense and hyperintense to the muscle on T1- and T2-weighted images, respectively, and showed homogeneously strong enhancement on contrast-enhanced T1-weighted images. The medial pe-ripheral portion, which was isointense on T2-weighted images and showed less enhancement on contrast-enhanced T1-weighted images, corresponded to the hypocellular and col-lagenous sclerotic area on pathologic correlation. Solitary fibrous tumor is a rare spindle-cell tu-mor that typically appears as a pleura-based mass despite the recent increasing recognition of its ex-trapleural location. In the English-language medical literature, only a few cases of solitary fibrous tumo