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Immunohistochemical (IHC) features of PSCCT (40× magnification). IHC staining for (A) p63, (B) Ki67, (C) CD5, (D) CK19, (E) thyroglobulin, or (F) TTF-1 (4F). p63 and CK19 was deemed positive and thyroglobulin, CD5, and TTF-1 did not stain (negative). Ki67 proliferation index was 50%. PSCCT, primary squamous cell carcinoma of the thyroid.
