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. 2023 May 1;23:138. doi: 10.1186/s12876-023-02779-3

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© The Author(s) 2023

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. 3 — Case 2.1: A case of pancreatic lymphoma that was not definitively diagnosed from specimens obtained by endoscopic ultrasonography–guided fine-needle aspiration. A 65-year-old man was admitted to our hospital with acute pancreatitis. Contrast-enhanced computed tomography showed a homogeneous mass in the pancreatic head measuring 55 mm in maximum diameter and slight dilation of the caudal main pancreatic duct (MPD) at 3.42 mm (a). In endoscopic retrograde pancreatography, the MPD localized in the tumor was visible and narrowing smoothly, and the caudal MPD was mildly dilated (b). Endoscopic ultrasonography found a 50 mm round hypoechoic tumor with a clear boundary and scattered high echoic spots (c) suggesting autoimmune pancreatitis. Cytologic assessment of the tumor using EUS-FNA revealed atypical lymphocyte accumulation suggesting malignant lymphoma (d)