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. 2024 May 23;16(10):659–667. doi: 10.1080/1750743X.2024.2353535

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© 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent.

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Figure 1. — Pathology of the trichilemmal carcinoma patient. (A & B) Initial postoperative pathology showed that malignant transformation of outer root sheath tumor and nests of atypical cells with keratinization and necrosis, diagnosed as trichilemmal carcinoma (TC) with parotid gland and lymph node metastasis. (C & D) The pathology of re-excision showed that there were large necrotic foci in the hyperplastic fibrous tissue, small nested atypical cells, a large amount of foam cell infiltration, confirmed metastatic TC with extensive necrosis and perineural invasion. (A & C hematoxylin and eosin ×100, B & D hematoxylin and eosin ×40).