a communication between an inside structure and an outside structure. The typical application of a fistula in the exstrophy/epispadias patient is a small undesired leakage between the surgically reconstructed urethra and the outside of the penis. This is known as a urethrocutaneous fistula. In addition, fistulas can occur between the bladder and the abdominal skin. This is called a vesicocutaneous fistula and is more rare than a fistula on the penis.
a hole that can open up in the newly formed urethra through which urine leaks
A condition where, after surgery, holes appear in the repaired urethra. Depending on the severity, this can result in dribbling and or spraying from the shaft of the penis while urinating. These can resolve spontaneously but often need to be closed surgically to stop the leakage.