An Unexpected Passage: A Complex Enterovesicular Fistula.

Enterovesicular fistulas (EVFs) are abnormal connections between the colon and the urinary bladder. They are estimated to account for one in every 3,000 surgical hospital admissions and are rarely associated with long-standing Crohn's colitis. We present an interesting case of a 93-year-old man with a long-standing history of Crohn's colitis on mesalamine, whose mechanical fall at home lead to the discovery of a colovesicular fistula with invading urothelium concerning for squamous cell carcinoma.