Fig. 3

Histological and immunohistochemical features of the intestinal tumor. a Low-power view with HE staining indicates sheets of tumor cells invading the myometrium and submucosa. b High-power HE view suggests that the tumor cells are small, round and form Homer-Wright structures. The boxed region is amplified in the upper right corner and is used to show pathological mitosis. c-f The tumor is positively stained for Vimentin, Syn, CD99, and the Ki-67 index is high (~40%). All immunohistochemistry images were taken under 200× magnification