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2025 Pediatric Surgery Update Course - Updates in Colorectal: Debunking Dogma
With Dr. Jamie Harris · hosted by Dr. Nelson Rosen
Chapter 1 of 5 · Case-Based Learning
Vestibular fistula
Introduction and First Case: Vestibular Fistula Management
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Educational content from recorded physician discussions — not medical advice. Talk to your (or your child's) care team about your situation.
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What the experts said
When dilating a vestibular fistula preoperatively, dilation should be limited to 7 Hegar to maintain patency for soft stool passage while minimizing scarring of the fistula tract that could complicate subsequent PSARP.
Preoperative fistula dilation is a controlled tear rather than true stretching when the fistula starts as a pinhole; it should be dilated only enough to allow stool passage, then left alone until definitive repair.
The perineal body-preserving PSARP technique is essentially the same approach used for bulbar fistulas, applied to vestibular fistulas.
The key technical principle for perineal body-preserving PSARP is to thoroughly mobilize the lateral planes and posterior wall of the rectum before attempting to dissect the anterior common wall with the vagina.
If visualization is inadequate during perineal body-preserving PSARP, the incision can be extended to convert to a standard PSARP approach.
Preoperative dilations appear to be better tolerated by families than postoperative dilations, with families particularly worried about hurting the surgical repair.
Family competence with rectal irrigations is critical for managing post-pull-through enterocolitis; families skilled at irrigations can initiate treatment before contacting the surgeon, potentially saving the baby's life.
The length of aganglionic segment in Hirschsprung disease affects timing decisions for pull-through; longer segments may require earlier intervention if families cannot achieve adequate decompression with washouts at home.
Ultrasound guidance for Botox injection allows visualization of all sphincter layers (internal and external anal sphincter, superficial external anal sphincter, puborectalis), the needle trajectory, and diffusion of the injected medication.
Absent ganglion cells in fistula tissue does not necessarily indicate Hirschsprung disease, as fistula tissue is not physiologic tissue; however, it may warrant further workup.
Patients with ARM and chromosomal anomalies who are not responding to laxatives and enemas should be worked up for possible co-existing Hirschsprung disease.
Excessive bowel mobilization during PSARP may result in injury to blood vessels and nerves, potentially leading to prolonged bowel management problems.
When sending fistula specimens for pathology evaluation in ARM cases, it is important to communicate with the pathologist to ensure they are examining deep, full-thickness bowel rather than distal fistula tissue.
Two 2021 studies (one NISQIP, one PCPLC multi-institutional) found no significant difference in wound complications, re-operations, or readmissions between neonatal PSARP (performed within 7-14 days) and delayed PSARP (performed at 6 weeks to 8 months) for female perineal or recto-vestibular fistulas.
Perineal body-preserving PSARP demonstrated at one-year follow-up: no dehiscence, no prolapse, 13% requiring anal stenosis revision, and two-thirds of patients discharged on postoperative day one.
Perineal body-preserving PSARP does not add operative time compared to standard PSARP based on small case series data.
Postoperative anal dilations after PSARP are associated with parental anxiety, PTSD for both patients and caregivers, and post-traumatic stress symptoms in families.
A Spanish single-institution study showed that children with adequately sized neo-anus at initial postoperative assessment (per age-based sizing table) who did not receive dilations had similar outcomes to those who were dilated.
In a single-institution review of children under 2 years, comparing dilations versus no dilations showed equal rates of re-operation for neo-anal stricture (2 patients in each group) and similar rates of Heineke-Mikulicz stricturoplasty (approximately 15% in each group).
A 2021 PCPLC retrospective multi-center study of Hirschsprung disease found no difference in preoperative enterocolitis, postoperative enterocolitis, or fecal incontinence between neonatal pull-through (median age 11 days) and delayed primary pull-through (median age 98 days).
A 2022 multi-center retrospective study found that 24% of Hirschsprung disease patients received at least one Botox injection.
A prospective Cincinnati Children's study (2020-2024, unpublished) found that Botox injection at time of Hirschsprung pull-through reduced enterocolitis risk within 31 days postoperatively from approximately 50% to 30%.
The same Cincinnati Children's Botox study found that 60% of patients who received Botox at pull-through developed diaper rash.
Early work from Boston (Sam Nurko's group) used weight-based Botox dosing up to a maximum of 100 units for Hirschsprung disease.
The co-occurrence rate of Hirschsprung disease and anorectal malformation is approximately 2% based on Pena's series, though some papers report rates as high as 3-4% or as low as less than 1%.
A PCPLC single-center study examining rectal fistula specimens taken during PSARP found ganglion cells present in 90% of specimens, with hypoganglionosis or absent ganglion cells in the remainder.
Patients with both Hirschsprung disease and anorectal malformation tend to have chromosomal anomalies, particularly Trisomy 21 and Pallister-Hall syndrome.