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(a) Sheets of round cells with basophilic cytoplasam, high nuclear-cytoplasmic ratio and indistinct cell boundaries (H and E, ×40). (b) The presence of mitotic figures (H and E, ×40). (c) The tumor cells show diffuse positivity for vimentin (immunohistochemistry, ×10). (d) The tumor cells show focal positivity for smooth muscle actin (immunohistochemistry, ×10)
