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;