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. 2021 Sep 16;9(26):7901–7908. doi: 10.12998/wjcc.v9.i26.7901

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©The Author(s) 2021. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/Licenses/by-nc/4.0/

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Case 2. A: A sinus approximately 2 cm in size in the right inguinal region; B: The sinus on abdominal computed tomography; C: A mass in the right iliac fossa with unclear local and cecal boundaries; D: A horseshoe-shaped mass in the ascending colon; E: Pathology of the colon mucinous adenocarcinoma (hematoxylin-eosin staining, 20 ×).