What is a J-pouch, and who is it for?
A J-pouch (ileoanal pouch) is an internal reservoir a surgeon builds from the end of the small bowel after removing the colon and rectum, so you can pass stool the usual way instead of having a permanent stoma. It is mainly an option for ulcerative colitis, not usually for Crohn's, and it needs a working anal sphincter. It is built in two or three stages, and a common later issue is pouchitis, inflammation of the pouch.
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A J-pouch is one of the things people most want to understand before colon surgery, because it can mean avoiding a permanent stoma.
What it is
After the colon and rectum are removed, the body still needs somewhere to collect stool. In a J-pouch operation, the surgeon builds an internal pouch from the ileum, the end of the small intestine, which acts as a reservoir and connects to the anus (Cleveland Clinic). The result is that stool can pass the usual way rather than into a bag.
Who it is for
A J-pouch is mainly an option in ulcerative colitis. The Crohn's & Colitis Foundation describes it as the most common operation recommended for ulcerative colitis when medication can no longer control symptoms, or in an emergency (Crohn's & Colitis Foundation). It is not usually offered in Crohn's disease, because Crohn's can affect the small bowel and the pouch itself. It also needs the muscles and nerves of the anus to work well enough to control bowel movements (Cleveland Clinic).
Built in stages
A J-pouch is usually created over two to three stages, with a temporary ileostomy in place until the pouch is ready to use (Cleveland Clinic).
A common later issue: pouchitis
It is worth knowing the trade-offs. Cleveland Clinic notes that about half of people with a J-pouch develop pouchitis, inflammation of the pouch, at some point; it is usually treated with antibiotics (Cleveland Clinic).