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. 2022 Mar 17;23(6):3242. doi: 10.3390/ijms23063242

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(A) Histology of a collision tumour in thyroid with primary follicular carcinoma (FCA) and metastatic renal cell carcinoma (RCC); (B) TTF-1 immunohistochemical stain is positive in the follicular cell carcinoma component; (C) CD10 immunohistochemical stain is positive in the renal cell carcinoma component.