Ulcerative colitis (UC) is a chronic mucosal inflammatory bowel disease of the colon and rectum bearing risk of cancer; frequent endoscopic surveillance is warranted. Over a third of patients with UC will ultimately require an operation, and although for specfic cases alternative operations can be pursued, most patients prefer an ileal pouch-anal anastomosis (IPAA) with J-pouch construction. However, the standard colectomy for UC includes low ligations of the main colonic vascular pedicle branches (ileocolic, right colic, middle colic and inferior mesenteric) that does not address a proper oncologic operation. A high ligation of the named vessels as well as a proper resection of the affected colon with its mesentery and lymph node package are needed to treat colon cancer. Analogous to a total mesorectal exicision for rectal cancer, a more radical procedure to remove the tumor and lymph node packet for colon cancer is described as a complete mesocolic exision (CME) in efforts to increase disease free survival. We demonstrate a laparoscopic subtotal colectomy for UC, with an oncologic complete mesocolic excision for a left transverse colon carcinoma in the setting of chronic mucosal inflammation secondary to chronic UC as the first procedure in a 3-staged IPAA. In the video, it is also demonstrated how the lymph node dissection is extended towards the greater gastric curvature and comprising omentum and gastrocolic ligament. There were no postoperative complications in the 55-year old male patient.