Does ano rectal fistula narrows the lumen of rectum?

An anal rectal fistula can potentially narrow the lumen of the rectum, depending on its size and location. The presence of the fistula may lead to inflammation and scarring, which can constrict the surrounding tissue and affect the rectal passage. However, not all fistulas result in significant narrowing; the extent of lumen narrowing varies from case to case. Treatment is often necessary to alleviate symptoms and restore normal function.