Fig. 3

Immunohistochemical staining. a-b: CD34 underlined the rich and delicate vascular channels, while the tumor cells were negative for CD34. c-d: The tumor cells expressed EMA in a paranuclear dot-like or a ring-like pattern. e-k: The tumor cells were diffusely positive for GFAP, CD56 and S100, but negative for synaptophysin, olig2, inhibin-α and NeuN. l: The Ki-67 labeling index was approximately 2%