Inclusion Criteria:  Age between 18 and 75 years American Society of Anesthesiologists (ASA) score I to III A biopsy proven histological diagnosis of colorectal carcinoma Preoperative staging cT2-4aN0M0 or cTanyN+M0 tumor located at hepatic flexure or transverse colon close to flexures Undergoing complete mesocolic excision with right gastric mesentery resection Patients have to be aware of the aim of the trial, and have signed the informed consent.  Exclusion Criteria:  Synchronous colorectal carcinoma Clinical evidence of metastasis History of colorectal cancer or other malignant tumors Preoperative staging cT1N0 or cT4bNany Emergency procedure