Rectovestibular fistula

Rectovestibular fistula is a congenital anomaly where there is an abnormal connection between the rectum and the vestibule of the vagina. This condition is a type of anorectal malformation (ARM) that predominantly affects females. It represents a spectrum of disorders where the fecal matter is misdirected from the rectum to an incorrect anatomical location, in this case, the vestibule, which is the area into which the vaginal canal and the urethra open.

Etiology

The exact cause of rectovestibular fistula is not well understood, but it is believed to be related to abnormal development of the embryo during the early stages of pregnancy. Genetic factors, environmental influences, and maternal health conditions may play roles in its development. It is considered a part of the spectrum of anorectal malformations which are thought to occur due to the improper separation and differentiation of the cloaca into the rectum and urogenital sinus during embryonic development.

Symptoms and Diagnosis

Infants with a rectovestibular fistula may present with the passage of stool through the vaginal opening, recurrent urinary tract infections, and difficulty with bowel movements. Diagnosis is often made shortly after birth by physical examination. Further diagnostic procedures may include ultrasound, MRI, or contrast studies to delineate the fistula's path and identify any associated anomalies.

Treatment

The primary treatment for rectovestibular fistula is surgical correction to restore normal anatomy and function. The specific surgical approach depends on the fistula's size and location, as well as the presence of any associated conditions. The most common procedure is the posterior sagittal anorectoplasty (PSARP), which allows for the precise repair of the fistula and reconstruction of the anal canal in its correct position. Postoperative care is crucial for ensuring proper healing and includes bowel management programs to prevent constipation and protect the surgical site.

Prognosis

With timely and appropriate surgical intervention, most individuals with rectovestibular fistula can expect a good prognosis. Successful surgery allows for normal bowel function, although some patients may experience long-term issues such as constipation or fecal incontinence, which can usually be managed with medical and behavioral therapies. Ongoing follow-up with a multidisciplinary team including pediatric surgeons, gastroenterologists, and urologists is essential for addressing any complications and ensuring optimal outcomes.

See Also

• Anorectal malformation
• Vestibule of the vagina
• Congenital disorder
• Pediatric surgery