Fig. 3

The microscopic and immunohistochemical features. a The tumor cells were arranged in a nodular shape and showed infiltrating growth into the surrounding fat and muscle tissue (H&E, × 100). b The nodules were separated by a large volume of fibrous tissues (H&E, × 200). c: Cells showed uniform size, round nuclei, nonobvious entoblasts, and slightly stained cytoplasm, and mitosis could be seen in highly cellular areas (H&E, × 400). d In a few nodules, the cells were loosely arranged and connected into a reticulated or crossed appearance in the myxoid stroma (H&E, × 100). e Immunohistochemically, the tumor cells were positive for CD117(× 200). f Immunohistochemically, the tumor cells were positive for CD56(× 200)