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. 2024 Dec 4;10:274. doi: 10.1186/s40792-024-02068-5

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© The Author(s) 2024

Open Access This 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/.

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Fig. 3 — Pathological findings. Histopathologically, adenocarcinoma was located mainly in the right hepatic and common bile ducts (innumerable tumors, maximum diameter: 5.6 cm, papillary-infiltrating type, papillary adenocarcinoma > moderately differentiated tubular adenocarcinoma > mucinous adenocarcinoma). No vascular invasion was observed. Lymphatic metastasis was observed in a lymph node on the posterior surface of the pancreatic head (pathologically minimal lymphatic invasion). a The tumor invaded the bile duct wall and the liver parenchyma in some areas. b Biliary intraepithelial neoplasia was also observed in the left hepatic duct. Pathological diagnosis: pT2b, pN1, M0, Stage IIIc (UICC, 8th edition)