Which aery is not ligated during caecum surgery
Right hemicolectomy Carcinoma of the caecum or ascending colon is treated by right hemicolectomy. At open surgery the peritoneum lateral to the ascending colon is incised, and the incision is carried around the hepatic flexure. The right colon and mesentery are elevated, taking care not to injure the ureter, gonadal vessels or the duodenum. The ileocolic aery is ligated close to its origin from the superior mesenteric aery ('high-tie') and divided. Where the right colic aery has a separate origin from the superior mesenteric aery (around 10% of patients) this is separately ligated. The mesentery of the distal 20 cm of ileum and the mesocolon as far as the proximal third of the transverse colon is divided. The greater omentum is divided up to the point of intended division of the transverse colon. When it is clear that there is an adequate blood supply at the resection margins, the right colon is resected, and an anastomosis is fashioned between the ileum and the transverse colon. If the tumour is at the hepatic flexure the resection must be extended fuher along the transverse colon and will involve dividing the right branch of the middle colic aery. Extended right hemicolectomy Carcinomas of the transverse colon and splenic flexure are most commonly treated by an extended right hemicolectomy. The extent of the resection is from the right colon to the descending colon. The mobilisation is as for a right hemicolectomy but dissection continues to take down the splenic flexure and the whole transverse mesocolon is ligated. Some surgeons prefer to perform a left hemicolectomy for a splenic flexure cancer. Left hemicolectomy This is the operation of choice for descending colon and sigmoid cancers . The left half of the colon is mobilised completely along the 'white line' that marks the lateral attachment of the mesocolon. As the sigmoid mesentery is mobilised, the left ureter and gonadal vessels must be identified and protected. The splenic flexure may be mobilised by extending the lateral dissection from below and completed by entering the lesser sac. The inferior mesenteric aery below its left colic branch, together with the related paracolic lymph nodes, is included in the resection by ligating the inferior mesenteric aery close to its origin ('high-tie'). For full mobility the inferior mesenteric vein is also ligated and divided at the lower border of the pancreas. The bowel and mesentery can then be resected to allow a tension-free anastomosis. A temporary diveing stoma may be fashioned upstream, usually by formation of a loop ileostomy. This is usually undeaken if the anastomosis is below the peritoneal reflection of the rectum, because healing is more likely to be impaired distally. Ref: Bailey and love 27th edition Pgno : 1264
Ileocolic
Right colic
Left colic
Right branch of middle colic
G.I.T