**Core tip:** Leaks from the tip of the J-pouch are less likely to occur but are associated with pouch failure after ileal pouch-anal anastomosis. Salvage surgery has been commonly performed to resolve these leaks, and the surgery typically includes laparotomy with either pouch repair or pouch resection. In this report, we present a patient with a fistula on the tip of the "J" in the pouch who was successfully treated with the over-the-scope clip system. We propose that this method could be used as an alternative to surgery to avoid surgery-related complications in patients with pouch fistula.

INTRODUCTION
============

A leak from the tip of the J-pouch was defined as a leak from the blind limb of the J-pouch with an endoscopic finding or imaging results, including a Gastrografin enema, computed tomography scan, magnetic resonance imaging, or intraoperative diagnosis made during reoperation\[[@B1]-[@B3]\]. Although leaks from the tip of the J-pouch are less likely to occur than leaks from anastomosis, these leaks are known to be associated with pouch failure after ileal pouch-anal anastomosis (IPAA). Salvage surgery has been commonly used for leaks and typically includes laparotomy with either pouch repair or pouch resection\[[@B3]\].

Recently, interventional endoscopy has evolved into an effective alternative to salvage surgery for leakages or perforations if the patient is not in a critical septic condition\[[@B4],[@B5]\]. The over-the-scope clip (OTSC) system (Ovesco Endoscopy AG, Tübingen, Germany) was initially developed for hemostasis and leakage closure in the gastrointestinal tract during flexible endoscopy. These "bear claws" apply high compression forces on the tissue and facilitate stable closure\[[@B2]\]. In cases of sufficient closure, surgical intervention can be avoided. For acute endoscopy-associated perforations, the mean success rate is 90%. For postoperative leaks, the success rate is 68%\[[@B6]\]. However, the usage of OTSC in pouch fistula has not been reported yet. Due to the success of the technique and the opportunity to avoid the considerable risks of surgery, we tested the OTSC system in this patient and achieved success.

Endoscopic management of leakage and perforation in the upper gastrointestinal tract has gained prominence because it enables minimally invasive treatment of fistulas and avoids the morbidity and mortality of surgical intervention. However, it is important that the lesion is fresh, does not have fibrotic alterations or inflammation and is usually free from foreign bodies in the leakage area\[[@B1]\]. In this case, we used an active washing and drainage system for 4 wk to make the lesion of the fistula clear and reduce inflammation before the endoscopic closure.

CASE REPORT
===========

A 26-year-old male patient was admitted to our hospital due to fever and severe bloody diarrhea. Endoscopy revealed acute ulcerative colitis with a Mayo score of 12. He failed to respond to intravenous corticosteroid therapy, and toxic megacolon appeared. He underwent a total laparoscopic restorative proctocolectomy with IPAA (with a loop ileostomy). After surgery, the patient recovered without complications and was discharged 10 d after the operation. Six weeks later, he was readmitted to our department for ileostomy reversal. Prior to the operation, pouch endoscopy, antegrade Gastrografin enema, and an abdominal computed tomography scan did not reveal an abnormality. A stapled side-to-side ileostomy reversal was performed, and he was discharged 3 d after the operation. One month after the final operation, he developed a high fever again (39.9 °C) with stool leaking from the right lower abdominal trocar site. Colonoscopy and a Gastrografin enema confirmed there was a fistula on the tip of the "J" Pouch (Figures [1](#F1){ref-type="fig"} and [2](#F2){ref-type="fig"}). He was treated with percutaneous drainage, total parenteral nutrition (TPN) and bowel rest. Signs of intra-abdominal sepsis were controlled after 4 wk of therapy. However, there was persistent feculent discharge from the fistula tract. The patient was comprehensively informed about the endoscopic procedure.

![Methylene blue was injected *via* the trocar site and flooded the enteric cavity to reveal a leak in the pouch.](WJGE-9-95-g001){#F1}

![Urografin was injected *via* the sinus, and the pouch was visualized to confirm a fistula on the top of the "J" pouch.](WJGE-9-95-g002){#F2}

DISCUSSION
==========

Alternatives, such as surgical treatment, were also discussed with the patient, and written informed consent was obtained. The patient was informed about the possible failure of the endoscopic procedure and the eventual need for an operation that may lead to pouch repair or even pouch resection. Endoscopic evaluation and a Methylene blue injection demonstrated a pouch-cutaneous fistula on the tip of the "J" pouch. Suction was used to draw the defect into the OTSC applicator cap, and the clip (12-mm OTSC) was applied, which completely closed the fistula tract (Figure [3](#F3){ref-type="fig"}). The complete procedure was performed in 21 min. After the procedure, he was given TPN and bowel rest for another 2 wk to allow the fistula to heal. Then, he resumed oral feeding without signs of a fistula or leakage. He was followed up with for another 2 mo and remained asymptomatic. A Gastrografin enema later confirmed that the fistula tract had healed (Figure [4](#F4){ref-type="fig"}).

![Fistula was closed by the over-the-scope clip system.](WJGE-9-95-g003){#F3}

![Gastrografin enema confirmed the fistula was closed.](WJGE-9-95-g004){#F4}

In conclusion, although the OTSC system had mostly been used for treating upper gastrointestinal perfusion and fistulas and fistulas on the top of the pouch are rare and often are cured through surgery, we still suggest attempting OTSC to treat a pouch fistula due to the easy manipulation and reduction of immediate operative intervention rates, and length of hospitalization\[[@B7],[@B8]\]. Even if the endoscopic closure failed, the salvage surgery would still be feasible.

ACKNOWLEDGMENTS
===============

We thank Zhi-Ming Wang and Yan-Qing Diao for helping with the endoscopic closure.

COMMENTS
========

Case characteristics
--------------------

This was a young man with severe ulcerative colitis who received ileal pouch-anal anastomosis (IPAA) and developed a fistula after surgery.

Clinical diagnosis
------------------

Intestinal fistula.

Differential diagnosis
----------------------

Leaks from the tip of the J-pouch, Anastomotic fistula, Crohn's disease, abscess.

Laboratory diagnosis
--------------------

The patient had a high blood white cell count and fever; thus, he was diagnosed with an intra-abdominal infection.

Imaging diagnosis
-----------------

Leaks from the tip of the J-pouch.

Pathological diagnosis
----------------------

He was cured with non-surgical treatment, and there was no pathological diagnosis.

Treatment
---------

Closed the fistula with the over-the-scope clip (OTSC) system.

Related reports
---------------

A J-pouch is the most common configuration of IPAA used currently. Risk factors for pouch-related sepsis complications include steroid use, a body mass index greater than 30, a patient older than 50 years, diagnosis of inflammatory bowel disease, and surgeon inexperience. Surgical approaches have always been used for pouch-related sepsis arising from pouch fistula.

Term explanation
----------------

Fistula is a pouch-related septic complication. There are 4 main pouch sources of fistula, including the appendage, pouch reservoir, inflow limb, and pouch-rectal anastomosis. Each can fistulize to different areas, including the abdominal wall, vagina, bladder, and other loops of the small bowel.

Experience and lessons
----------------------

This was a successful application of OTSC to cure a patient with a pouch fistula that could partially replace surgery and avoid surgery-related complications. However, the authors must keep the tissue around the fistula fresh so percutaneous drainage, total parenteral nutrition and bowel rest were necessary.

Peer-review
-----------

The paper is well written.

Manuscript source: Unsolicited manuscript

Specialty type: Gastroenterology and hepatology

Country of origin: China

Peer-review report classification

Grade A (Excellent): 0

Grade B (Very good): 0

Grade C (Good): C, C, C, C

Grade D (Fair): 0

Grade E (Poor): 0

Institutional review board statement: This case report was exempt from the Institutional Ethics Committee of Jinling Hospital.

Informed consent statement: The patient involved in this study gave his written informed consent authorizing the use and disclosure of his protected health information.

Conflict-of-interest statement: The authors declare that they have no competing interests.

Peer-review started: September 28, 2016

First decision: October 26, 2016

Article in press: December 19, 2016

P- Reviewer: Goral V, Seow-Choen F, Tang ZP, Tham CK S- Editor: Qiu S L- Editor: A E- Editor: Li D

[^1]: Author contributions: All the authors contributed to the revision of this manuscript.

    Correspondence to: Wei-Ming Zhu, PhD, Institute of General Surgery, Jinling Hospital, Medical School of Nanjing University, \#305 East Zhongshan Road, Nanjing 210002, Jiangsu Province, China. <dr_zhuweimingvip@sina.com>

    Telephone: +86-25-4803956
