Abstract:Objective: to summarize the clinical characteristics of endoscopic submucosal dissection (ESD) in elderly patients and analyze the risk factors of perforation. Methods: All elderly patients who received colorectal ESD treatment in Beijing Friendship Hospital Affiliated to Capital Medical University from January 2017 to October 2020 were retrospectively summarized. The patient's medical history, characteristics of colorectal lesions, operation process and prognosis were analyzed. Results: A total of 278 subjects were collected, including 218 cases (78.4) aged 60-74 years, 60 cases (21.6) aged 75-89 years, and 0 cases ≥ 90 years old, with an average age of (68.62 ± 6.822) years. There were 32 cases of ileocecal lesions, 51 cases of ascending colon, 20 cases of transverse colon, 12 cases of descending colon, 54 cases of sigmoid colon and 109 cases of rectum. The average diameter of the lesions was (2.323 ± 1.356) cm. There were 150 cases of adenoma, 23 cases of high-grade intraepithelial neoplasia, 65 cases of malignant lesions, 18 cases of neuroendocrine tumors, 3 cases of benign lesions, and 19 cases of inflammation. There were 25 cases of intraoperative perforation and 2 cases of postoperative perforation. Conclusion: The incidence of perforation in colonic lesions was higher than that in rectal lesions. The incidence of perforation in proximal colon was higher than that in distal colon. The incidence of perforation in malignant lesions was higher. The larger the diameter of the lesion, the higher the risk of perforation; Malignant lesions, lesion diameter ≥ 2cm were independent risk factors for ESD perforation.