Ointment Fistulography: Introducing a Novel Technique for Single or Multiple Urethrocutaneous Fistula Diagnosis After Hypospadias Surgery.

Overview

abstract

INTRODUCTION AND OBJECTIVE: Hypospadias is a common congenital malformation of the male genital tract. The most frequent complication after hypospadias repair is urethrocutaneous fistula.¹ Its incidence has been reported up to 35% worldwide.² The diagnosis of these fistulas is sometimes challenging particularly with tiny and multiple fistulas. Usually, parents complain of urinary spraying, sprinkling, or passing a single stream of urine from the undersurface of the penis after the surgery. Urethrocutaneous fistulas are not always visible on physical examination. Locating the fistula and status of the surrounding skin is very important in order to choose the surgical repair technique.³ The patency and anatomy of the distal urethra should also be determined before the repair surgery.⁴ That is why urologists usually use retrograde urethrography or cystoscopy to find the location of fistula. However, these modalities have their own risk for children and are not always helpful. Sometimes the contrast media inserted can clog some fistulas especially near the glans and preclude the diagnosis. We present an easy technique to screen for urethrocutaneous fistulas after hypospadias surgery. TECHNIQUE: In this technique (Video 1), an antibiotic ointment is inserted through the meatus while the base of the penis is held; the ointment is then gently pushed through the meatus. As shown in the video, the ointment will protrude through the fistulas anywhere along the shaft. This technique can also be performed reversely as the ointment inserted from the fistulas will protrude from the meatus. For younger children under the age of 3, we exclusively perform this technique under anesthesia on the repair surgery day, whereas in toddlers we perform this technique in the office and once again under anesthesia right before the repair surgery. RESULT: This technique shows even tiny and multiple fistulas not detectable on physical examinations. We have used this technique in our clinic and have not missed any fistulas. The diameter of the protruded ointment in reverse fistulography is an indicator of the distal urethral diameter. Therefore, in case of narrow ointment diameter, distal urethral strictures should be suspected as correction of distal obstruction is an important determinant in the success rate of fistula repair surgery.⁵ CONCLUSION: We suggest this diagnostic technique as a safe, inexpensive, easy, office-based, feasible, and reproducible method. Negative urine culture is not required for this examination. Also, there is no need to insert contrast media as in retrograde urethrography or induce anesthesia as in cystoscopy. We believe this simple technique help urologists around the world to diagnose this common complication of hypospadias surgery without the need for special equipment.