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. 2021 Mar 11;16:20. doi: 10.1186/s13000-021-01079-2

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Mucinous borderline tumor (MBT). Intracystic epithelial proliferation of gastrointestinal-type epithelium with villoglandular arrangement (a) (H&E, 100x). Tumor structures showing increased proliferative activity in the crypts with mitoses and mild nuclear atypia, whereas other parts of the villoglandular structures consist of more mature cells (b) (H&E, 200x). MBT with intraepithelial carcinoma consisting of tumor cells with marked nuclear atypia and increased mitotic activity (c) (H&E, 200x). Diffuse immunohistochemical expression of cytokeratin 7 (d) (200x) and focal expression of cytokeratin 20 (e) (200x). MBT with focal, mostly weak expression of PAX8 (f) (200x)