Formation of S J and W pouches after colostomy. Ihe ileal pouch-anal anastomosis (IPAA), also called an ileo-anal pouch, restorative proctocolectomy, ileal-anal pullthrough, or sometimes a j-pouch, s-pouch, w-pouch or an internal pouch (or Kock pouch), is a surgically created internal reservoir to expel the waste from the body after entire or a part of the colon is rmeoved due to problems such as colon cancer, appendicitis, etc.
Your surgeon may remove all or a part of the bowel in a colostomy procedure. The surgeon may perform a colostomy if there's not enough healthy intestine after surgery. In a colostomy, one end of your large intestine is moved to the outside of the abdomen and is attached to a colostomy bag to expel the waste.