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. 2023 May 15;15(5):700–712. doi: 10.4251/wjgo.v15.i5.700

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©The Author(s) 2023. 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.

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A case of clinical complete response confirmed at pathology. A-C: A 61-year-old male patient with rectal cancer. Endoscopy (A) and magnetic resonance imaging (MRI) (B and C) findings staged a tumour of the low rectum (cT3aN1, mesorectal fascia negative, extramural venous invasion negative, pelvic nodes negative). The patient underwent neoadjuvant chemoradiotherapy; D-G: Restaging at 15 wk after the beginning of the neoadjuvant chemoradiotherapy showed a clinical complete response at endoscopy (D), MRI (E), endorectal ultrasound (F), and 18-fluorodeoxyglucose-computed tomography/positron emission tomography (G).