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. 2021 May 11;22(10):5077. doi: 10.3390/ijms22105077

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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 (https://creativecommons.org/licenses/by/4.0/).

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Malignant tumors with apocrine or eccrine differentiation I. (A1) (20×, HE) and (A2) (20×, CK7): adnexal adenocarcinoma, not otherwise specified, deeply invasive lesion, involves deep dermis and extends to subcutaneous tissues. (B1) (40×, HE) and (B2): Porocarcinoma characterized by infiltrative borders, and atypical cytological features, increased mitotic activity, and focal necrosis. (C1) (400×, HE) and (C2) (200×, Ki67): Hidradenocarcinoma, predominantly composed of bland, clear cells, with increased mitotic activity.