Four cases of enterovesical fistula and the importance of CT in the diagnosis.

Enterovesical fistula is an abnormal communication between the urinary bladder and intestine. Diverticulitis is the most common aetiology, accounting for approximately 50-70% of cases, and malignancy is the second most common cause, accounting for approximately 20% of cases. However, most patients are hospitalized because of urinary symptoms. The disease can be misdiagnosed if patients have been symptomatic for a long time before the diagnosis is made. Detection of enterovesical fistula and the underlying disease is important. However, the optimal diagnostic methods have not been clarified. CT scan is the most sensitive diagnostic modality, but should be backed up with cystoscopy, cystography, colonoscopy and barium enema.