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. 2017 Jun 7;23(21):3934–3944. doi: 10.3748/wjg.v23.i21.3934

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©The Author(s) 2017. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (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.

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Specimen and pathological analysis. The resected specimen showed stenotic sigmoid colon (A and B), with obvious compression by the metallic stent visible (C and D). Pathological analysis showed multiple ulcers in the mucosa (E, black arrow head), with the deepest ulcer penetrating through the muscle layer and reaching the mesenteric adipose tissue (F and H, black arrow head). Fibrous scar tissue (E, red arrow head) was visible at the ulcer base (G, black arrow head), but the structure of the mucosa around the ulcer was roughly normal (E, white arrow head), with no granuloma, vasculitis, lymphatic tissue hyperplasia, or full-thickness inflammatory changes (E-H). Hematoxylin and eosin staining; magnification of × 40 for E, × 100 for F and G, × 200 for H.