Figure 4.

Immunohistochemical photomicrographs. Immunohistochemicaly, the tumor cells showing A, Weak to moderate CD34 immunostaining (×200 original magnification). B, Strong and diffuse CD99 immunostaining (×200 original magnification). C, Ki-67 immunostaining, analyzed by ImmuoRatio quantitative image software, showing a 20% proliferative index (×400 original magnification).