Diversion colitis is an inflammation of the colon which can occur as a complication of ileostomy or colostomy, often occurring within the year following the surgery. It can also occur in a neovagina created by colovaginoplasty, sometimes several years after the original procedure.
Despite the presence of a variable degree of inflammation the most suggestive histological feature remains the prominent lymphoid aggregates. The diagnosis cannot be safely reached without knowing the clinical story. In many milder cases after ileostomy or colostomy, diversion colitis is left untreated and disappears naturally.
If treatment is required, possible treatments include short-chain fatty acid irrigation, steroidenemas and mesalazine.