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Figure 2: Photomicrographs show a spindle cell tumor with nuclear pleomorphism and mitotic figures (H&E, x200). Abrupt transition between predominant sarcomatoid areas and focal carcinomatous focus are evident on cytokeratin stain (IHC, x40). The spindle cell components are also immunopositive for vimentin (IHC, x100) and cytokeratin (CK, x200)

Figure 2: Photomicrographs show a spindle cell tumor with nuclear pleomorphism and mitotic figures (H&E, x200). Abrupt transition between predominant sarcomatoid areas and focal carcinomatous focus are evident on cytokeratin stain (IHC, x40). The spindle cell components are also immunopositive for vimentin (IHC, x100) and cytokeratin (CK, x200)