Lateral Pelvic Lymph Node Dissection for Rectal Neuroendocrine Neoplasms Undergoing Laparoscopic Total Mesenteric Excision

Inclusion Criteria: 1. Biopsy proven rectal neuroendocrine neoplasm (neuroendocrine tumor and carcinoma); 2. Meets any one of the following conditions: * Preoperative imaging examinations reveal that the maximum diameter of the tumor is greater than 2cm. * Preoperative imaging examinations reveal that the maximum diameter of the tumor is between 1-2cm and the clinical staging is T2 or higher. * Preoperative imaging examinations reveal that the maximum diameter of the tumor is between 1-2cm and is categorized as Grade 3 differentiation. * Recurrence after local excision under endoscopy. 3. Eastern Cooperative Oncology Group(ECOG) performance score ≤ 1; 4. Written informed consent; Exclusion Criteria: 1. Complete intestinal obstruction; 2. Hepatitis activity and peripheral neuropathy (such as peripheral neuritis, pseudo meningitis, motor neuritis, and sensory impairment); 3. Significant organ dysfunction or other significant diseases, including clinically relevant coronary artery disease, cardiovascular disease, or myocardial infarction within the 12 months before enrollment; severe neurological or psychiatric history; severe infection; active disseminated intravascular coagulation； 4. Pregnancy or breastfeeding; 5. Alcohol abuse or drug addiction; 6. Concurrent uncontrolled medical condition;