What are other causes for a rectovaginal fistula. not caused by child birth or ibd?

Diverticulitis: Most commonly in your age group fistulas form due to childbirth and complications of it. It is possible however to get information to cause a fistula as well. That is your reference to ibd. You can also get inflammation due to infection such as diverticulitis. These are small out of pouching's on the colon which can become infected and create fistulas.