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(a) Photomicrograph showing FL (arrowhead) and DLBCL (arrow) replacing normal thyroid parenchyma (hematoxylin and eosin; magnification 200×). (b) Ki-67 proliferation index is approximately 20% in the areas involved by FL and 90% in the areas involved by DLBCL (magnification 200×). The neoplastic B-cells are positive for (c) CD20 (magnification 200×) and (d) CD10 (magnification 200×).
