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Well-differentiated thyroid carcinoma with high-grade features. Papillary thyroid carcinoma showing necrosis (A, H&E stain, ×100) and high proliferative activity with a Ki-67 rate of 18% (B, H&E stain, ×400). Follicular thyroid carcinoma with necrosis (C, H&E stain, ×100) and high mitotic figure (D, H&E stain, ×400). Three mitotic figures (arrows) are noted in one high-power field.
