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Core needle biopsies of malignant thyroid nodules. (A, B) The biopsy specimen maintains the typical morphological features of papillary carcinoma. Poorly differentiated carcinoma shows solid, trabecular, and insular growth patterns (C) and mitosis (arrow) (D) under the high-power view. The medullary carcinoma shows the typical morphological features under the low-power view (E) and the high-power view (F).
