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Immunohistochemical staining of the ATC primary tumor that developed in the context of a Hürthle cell carcinoma. (A) H&E staining of ATC with epithelial-paucicellular pattern (40×), (B) Tg staining was negative; positively stained follicles (stars) were normal cells entrapped by the tumor cells (internal control); (10×) (C) PD-L1 staining was negative (10×).
