Figure 3

Histologic sections of case 2 displayed the sheets of atypia of epithelium-like cells and patchy necrosis (red arrow) (A). The tumor cells were spindle to oval, had abundant cytoplasm and prominentnucleoli (B). The tumor cells expressed CD68 (C), S100 (D), CKpan focal positive (E) and Ki-67 index 30% (F).