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spindle cell carcinoma. (a) Area with bland morphology compared to "fig 4b", H&E ×400. (b) Area with pleomorphic cells, and high mitotic activity, H&E × 400. (c) CK IHC, DAB, Hx, × 400. (d) CD10 IHC, DAB, Hx, × 400. (e) s100p, DAB, Hx, × 400 f- SMA IHC, DAB, Hx, × 400. See additional files 23, 24, 25, 2627, 28 for higher resolution images.
