Fig. 2

Histopathologic findings of the tumor. Hematoxylin and eosin staining. Low magnification (a) (×100) and high magnification (b) (×400) show the concentric perivascular proliferation of spindle-shaped cells with eosinophilic cytoplasm and bland nuclei. The tumor cells revealed positive reactivity for smooth muscle actin (c) (×200), caldesmon (d) (×200), and CD34 (e) (×200). Endothelial cells are also positive for CD34 staining as well as the tumor cells (e)