Inclusion Criteria:  Male or female age ≥ 18 years old. Planned resection due to benign or malign disease in the left colon or the rectum. Cognitive ability to take part in the study and understand the information the patient receives about participating in the study and provide informed consent.  Exclusion Criteria:  Pre-existing health conditions requiring surgery, such as intestinal obstruction or perforation, local or systemic infections, peritonitis, or intestinal ischemia. Non-curable metastatic disease (cancer with multi-organ metastases). Intestinal or anal stenosis or other obstructions distal to the anastomotic site. Contraindications to general anaesthesia. Other conditions upon surgeon's discretion that may warrant exclusion.