A Rare Case of Diverticulitis With a Colo-Adnexal Fistula.

Diverticulitis is a very common cause of hospitalization in the United States with fistula formation being a common complication. However, a fistula formation between the sigmoid colon and an ovary is an exceptional rarity. We present a case of a 22-year-old female with a colo-ovarian fistula misdiagnosed as a tubo-ovarian abscess after a recent episode of diverticulitis. Initial workup, imaging studies, and treatment ending with Hartmann's procedure with eventual colostomy reversal are described. A review of similar cases within the literature and fistulas is also presented.