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A fistula is defined as a communication between two major organs. A Rectovaginal Fistula (RVF) is a tract or hole between the rectum and the vagina. It allows the involuntary passage of faeces from the rectum through the vagina. Watch The Doctors TV: Rectovaginal Fistula explained.
A colovesical fistula is the presence of a communication between the lumen of the colon and that of the bladder, either directly or via an intervening abscess cavity (foyer intermediaire). When the communication is between the rectum and urinary bladder, the term rectovesical fistula is used.adiographic features. In most cases the fistula occurs thought the dome of the bladder (~ 60%). The posterior wall (~ 30%) and trigone (~ 10%) are less frequent sites 2. A colovesical fistulas and its cause can be visualised in a number of ways, although the fistulous tract itself is often difficult to demonstrated.