Natural Orifice Specimen Extraction Surgery (NOSES), which involves obtaining specimens from the abdominal cavity without any incisions, has attracted much attention in recent years, and it has been widely popularized in the treatment of rectal cancer because of its postoperative non-incision, advantages of less trauma, quicker recovery, and postoperative aesthetics. Anastomotic fistula is a serious complication of rectal cancer surgery. For patients at high risk of anastomotic fistula, prophylactic ileostomy is often performed intraoperatively to divert feces and protect the anastomosis. For such patients, rectal anterior resection surgery with specimen extraction via stoma (NOSES with specimen extraction via stoma) is usually performed, borrowing a prophylactic stoma incision to retrieve the specimen, and also realizing the absence of additional abdominal incision. However, this procedure is prone to stoma infection and has a high complication rate (20-40%), which limits the popularization of NOSES surgery and is an urgent clinical problem. Our center has proposed a new stoma closure method (Dumpling Suture Method), which reduces the size of the incision by folding the suture to achieve the effect of hiding the skin incision and reduce stoma infection. The study aimed to introduce the "Dumpling suture method" of protective loop ileostomy in laparoscopic anterior resection and compare this new method with the traditional method. From August 1st 2019 to August 1st 2023, 22 cases of the new procedure were completed in our center, and 30 patients with stoma closure by the traditional method were included in the same period for control purposes. A retrospective analysis was conducted on 52 patients in the study center, and the intraoperative details and postoperative outcomes of the two groups were measured.

Inclusion Criteria:

1. All patients underwent successful laparoscopic anterior rectal resection plus protective loop ileostomy with specimen extraction through stoma incision;
2. All patients were pathologically diagnosed with rectal carcinoma or ulcerative colitis;
3. Patients aged 18 - 80 years
4. ASA (American Society of Anesthesiologists) classification ≤ grade 3.
5. Patient participate voluntarily and sign an informed consent form

Exclusion Criteria:

1. Patients with distant metastasis;
2. Patients with colon cancer;
3. Patients with a history of previous abdominal surgery;
4. ASA (American Society of Anesthesiologists) classification > grade 3;
5. Patients who underwent emergency surgery;
6. Patients who underwent surgery ≤ 3 weeks from the last chemotherapy ;
7. Patients lost to follow-up.

In this study personal information and data such as patient history, physical examination results, surgical records, and study questionnaire data will be collected. These data will be used to evaluate the efficacy and safety of the new procedure and for academic publication. The researcher will treat the patients' personal data confidentially and anonymize the data and information in any public release of the results of the study.