Case Report
Copyright ©The Author(s) 2022. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Clin Cases. Jun 26, 2022; 10(18): 6136-6140
Published online Jun 26, 2022. doi: 10.12998/wjcc.v10.i18.6136
Carcinoma located in a right-sided sigmoid colon: A case report
Liang-Jing Lyu, Wei-Wu Yao
Liang-Jing Lyu, Wei-Wu Yao, Department of Radiology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200336, China
Author contributions: Lyu LJ and Yao WW wrote the manuscript; all authors have read and approve the final manuscript.
Informed consent statement: Written informed consent was obtained from the patient for publication of this report.
Conflict-of-interest statement: The authors declare that they have no conflicts of interest.
CARE Checklist (2016) statement: The authors have read the CARE Checklist (2016), and the manuscript was prepared and revised according to the CARE Checklist (2016).
Open-Access: 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: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Wei-Wu Yao, Doctor, MD, PhD, Chief Physician, Professor, Department of Radiology, Tongren Hospital, Shanghai Jiao Tong University School of Medicine, No. 1111 Xianxia Road, Shanghai 200336, China. yaoweiwuhuan@163.com
Received: October 23, 2021
Peer-review started: October 23, 2021
First decision: November 18, 2021
Revised: November 27, 2021
Accepted: April 21, 2022
Article in press: April 21, 2022
Published online: June 26, 2022
Processing time: 236 Days and 18.9 Hours
Abstract
BACKGROUND

A right-sided sigmoid colon is an extremely rare anatomic variation that should be considered as a possibility by surgeons and radiologists before surgery. Here, we report the first clinical case of a carcinoma in a right-sided sigmoid colon revealed by a preoperative computed tomography (CT).

CASE SUMMARY

A 56-year-old Chinese man was admitted to the hospital with abdominal pain. CT revealed a redundant sigmoid colon with a mass on the right side of the cecum and ascending colon. Laparoscopy confirmed an abnormal course in the descending colon and sigmoid colon. Subsequently, hemicolectomy was performed in an open manner after laparoscopic exploration. Pathological examination revealed an infiltrative mucinous adenocarcinoma with two lymph node metastases. The patient was discharged without any complications after a week. There were no signs of recurrence or metastasis during the 3-month follow-up period.

CONCLUSION

We report a rare anomaly of a right-sided sigmoid colon with carcinoma, which should be differentiated from ascending colon cancer and pericecal hernia to prevent errors and other surgical complications.

Keywords: Right-sided sigmoid colon; Sigmoid colon; Colon carcinoma; Redundant sigmoid colon; Pericecal hernia; Case report

Core Tip: The right-sided sigmoid colon was first described by a few cadaveric studies and may not have been fully recognized by clinicians in recent years due to its relative rarity. Recognizing this variation is essential for interventional and diagnostic colonoscopy and associated surgeries. This is the first clinical case of a carcinoma located in a right-sided sigmoid colon.