To compare the efficacy of two different endoscopic resection methods in the treatment of rectal neuroendocrine tumors (NET) less than 10mm in diameter.

A total of 43 cases of rectal submucosal tumors from September 2019 to September 2022 were retrospectively collected. After relevant examination and treatment in our hospital, postoperative pathological findings of rectal neuroendocrine tumors were confirmed.27 cases were resected by ESD and 16 cases by CS-EMR. The size of lesion, resection area, resection time and postoperative pathological evaluation were compared between the two groups.

The surgical resection area of CS-EMR group and ESD group was (46.75±14.65) mm² and (185.96±117.33)mm², respectively P<0.05, operation time (13.69±3.95)min compared with (40.26±8.93) min, P<0.05, there were significant differences.There were no significant differences in R0 resection, vertical resection margin, vascular, lymphatic, nerve invasion, incidence of postoperative complications, and postoperative additional operation (P>0.05).

Both CS-EMR and ESD methods are safe and effective for carcinoids with a diameter of less than 1 cm located in the rectum without lymph node metastasis. New-style(CS-EMR) method is relatively simple to operate, and has advantages of short operation time and postoperative hospital stay. Compared with ESD method, there was no increase in the rate of positive postoperative margin and postoperative additional surgery.