Fig. 2

(A) Positivity for α-SMA accentuates the perivascular arrangement (bar = 50 μm). (B) The expression of h-caldesmon is focal to smooth muscle in visceral organs and blood vessels, as well as myoepithelial cells. (bar = 50 μm). (C) The tumor cells are negative for CD34 but endothelial cells lining the lumen of small blood vessels are positive. (bar = 50 μm). (D) Positive results for β-catenin can serve as evidence to exclude solitary fibrous tumors. (bar = 50 μm) (E) The tumor cells are negative for Desmin (bar = 50 μm). (F) The tumor cells showing a high Ki-67 labeling index (20%). (bar = 50 μm)