Abstract:Objective To explore the efficacy and safety of endoscopic submucosal dissection (ESD) and endoscopic mucosal resection (EMR) in treatment of duodenal precancerous lesions and early duodenal carcinoma.Methods A retrospective study was conducted to analyze the clinical data of 16 patients with duodenal precancerous lesion or early stage cancer who were treated with ESD and EMR from September 2016 to March 2021 were collected, and evaluated the clinical efficacy and safety of ESD and EMR treatment.Results Among the 16 patients, 14 cases were located on the opposite or contralateral side of the descending nipple, 2 cases were located at the junction of the descending nipple, the size of the lesion was 0.8 ~ 2.6 cm, with an average of (1.2 ± 0.7) cm, the size of the resected specimen was 1.5 ~ 3.5 cm, with an average of (2.2 ± 0.8) cm, and the operation time was 54 ~ 127 min, with an average of (68.6 ± 25.9) min. 9 cases were excised at one time; In 7 cases, the mucosal layer and submucosal layer were cut along the 3 mm ring of the lesion periphery, and the remaining tissue was excised by a trap, and the residual tissue was excised by a bowl shaped thermocoagulation forceps. Suture the wound with hemostatic clip or purse suture with a hemostatic clip and nylon rope. Postoperative perforation occurred in 1 patient after ESD, and laparoscopic local repair was performed, the patient recovered well after surgery and was discharged from hospital. The other patients had no complications and had good healing recovery.Conclusion Endoscopic minimally invasive resection is an important treatment method for precancerous lesions and early cancers of the duodenal mucosa, with definite efficacy. Postoperative delayed perforation is the main complication.