Published online Dec 26, 2020. doi: 10.12998/wjcc.v8.i24.6346
Peer-review started: July 1, 2020
First decision: August 8, 2020
Revised: August 14, 2020
Accepted: November 12, 2020
Article in press: November 12, 2020
Published online: December 26, 2020
Processing time: 171 Days and 7.6 Hours
Colonic duplication is a rare congenital anomaly. Many types of heterotopic tissue were identified within the wall of duplication. However, studies of ectopic immature renal tissue (EIRT) involving colon duplication in an adult have yet to be reported.
A 23-year-old woman visited our hospital with symptoms of recurrent abdominal pain and chronic constipation. Image analysis via abdomino-pelvic computed tomography, Gastrografin contrast study, and colonoscopy showed a blind and dilated bowel loop filled with fecal material located on the mesenteric side of the sigmoid colon. We established a diagnosis of sigmoid colon duplication and decided to perform a laparoscopic investigation. Segmental resection of the sigmoid colon with duplication was done. Microscopically, the duplicated segment showed all three layers of the bowel wall and EIRT in the wall of the duplication. The postoperative period was uneventful and the patient was discharged nine days after the surgery without complications. She has been doing well 12 mo after the follow-up period.
A comprehensive histopathologic examination for ectopic tissues or tumors is mandatory after resection of colon duplication.
Core Tip: Many types of heterotopic tissue were identified within the wall of duplication. We report an adult case of sigmoid colon duplication with ectopic immature renal tissue (EIRT). EIRT is a metanephric remnant arrested in an extra-renal site due to migratory defect and rarely results in extra-renal Wilms’ tumors. Detection of EIRT warrants a proper histological analysis for differential diagnosis between benign EIRT and a true Wilms’ tumor. This case highlights the importance of thorough histopathologic examination of ectopic tissues or tumors in colon duplications.