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. 2021 Feb 9;9(2):171. doi: 10.3390/biomedicines9020171

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© 2021 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 (http://creativecommons.org/licenses/by/4.0/).

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(A): Adenosquamous squamous cell carcinoma. Hematoxylin and eosin, 200×. (B): Perineural squamous cell carcinoma. Hematoxylin and eosin, 100×. (C): Papillary squamous cell carcinoma. Hematoxylin and eosin, 40×.