Solitary Fibrous Tumor Arising in the Buccal Space

Figure 1

(a) Intraoral photograph: a painless submucosal mass in the right buccal region. (b) Doppler ultrasonography of the buccal mass. High blood flow was observed around the nodular mass with low echogenicity. (c) Horizontal CT images. (d) MR images. T1-weighted imaging. (e) Tumor cells were arranged in a patternless manner. Variation in the size and shape of the cells or their nuclei was not conspicuous (FNAB hematoxylin/eosin staining). (f) Tumor cells showed diffuse positivity for CD34 (FNAB IHC) and (g) nuclear positivity for STAT6 (FNAB IHC).