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Posterior Sagittal Anorectaplasty-Female Part I: Pediatric Colorectal...

Video Published 2019-01-11 Updated 2026-06-22

Timestops (8)

0:02
Initial Examination and Anatomy Assessment
4:12
Surgical Approach and Equipment Setup
5:49
Diagnostic Cystoscopy Consideration
10:49
Laparoscopic Evaluation and Findings
15:16
Rectal Dissection and Lateral Plane
19:12
Bladder Identification and Anatomic Landmarks
21:39
Neovagina Reconstruction Decision Making
26:22
Laparoscopic Uterine Assessment and Future Planning

Topic Overview

Intraoperative discovery of vaginal agenesis during posterior sagittal anorectoplasty for anorectal malformation in a female infant. The surgical team identified a normal-appearing urethra and hymenal structure but no vaginal opening. Cystoscopy confirmed absence of a vaginal orifice communicating with the urethra. The discussion centered on whether to proceed with immediate neovaginal reconstruction using the distal rectum versus completing the anorectal repair and deferring vaginal reconstruction, with consideration for diagnostic laparoscopy to assess for upper vaginal structures and müllerian anatomy.

Key Takeaways

  • Vaginal agenesis with anorectal malformation: urethra is typically enlarged with thick rectal-urethral wall separation. (19:29)
  • Neovaginal reconstruction timing hinges on uterine presence—connection required before menarche if uterus present. (23:30)
  • Neonatal pelvic MRI/ultrasound often fails to delineate müllerian structures; upper vagina unlikely when lower absent. (3:46)
  • Distal rectum preservation critical for continence in patients with good bowel control potential. (26:26)
  • Cost-effective nerve stimulation uses anesthesia train-of-four box; requires grounded probe on wet skin. (8:08)

Inside this episode

Kai, the Library's AI content creator, listened to this episode and mapped who's speaking, the chapters, key claims, and cases. Every item links to the exact moment in the recording.

AI-enriched

Who's speaking

  • Mark — guest
  • Speaker 2 — host
  • Doctor Teitelbaum — guest
  • Tony Khoury — guest

Chapters

  • 0:00Initial examination and discovery of absent vagina — Foley catheter placement and perineal examination reveal normal urethra but no identifiable vaginal opening despite normal-appearing hymenal structure.
  • 4:50Intraoperative decision-making and cystoscopy — Team discusses options including cystoscopy to rule out urogenital sinus, diagnostic laparoscopy to assess upper vaginal structures, and whether to proceed with rectal repair versus immediate neovaginal reconstruction.
  • 10:30Surgical technique and nerve stimulation — Demonstration of cost-effective nerve stimulation technique using anesthesia train-of-four box with grounded probes. Discussion of lateral-to-anterior dissection approach and retraction methods.
  • 16:55Cystoscopy findings — Upside-down cystoscopy performed showing normal bladder, ureteral orifices, and bladder neck with no vaginal communication. Confirms enlarged urethra typical of absent vagina malformations.
  • 21:13Management debate and recommendations — Faculty discussion on timing of neovaginal reconstruction. Options include using distal rectum as neovagina now, sigmoid neovagina with laparoscopic approach, or deferring reconstruction 15-20 years. Emphasis on need for diagnostic laparoscopy to assess müllerian structures before final decision.

Key claims

  • 2:06Total body prep from nipples to toes is performed in supine position for these patients — Speaker 2
  • 2:21Foley catheter is typically placed in supine position before flipping patient prone over bump — Speaker 2
  • 3:46In a baby this small, MRI pelvis has difficulty delineating uterus and ovaries — Mark
  • 4:29Neonatal ultrasound was performed and was normal but did not specifically show vagina — Speaker 2
  • 8:08Cost-effective nerve stimulation uses anesthesia train-of-four box instead of dedicated pena stimulator — Speaker 2
  • 8:35With train-of-four stimulator, one probe must be grounded on wet skin while touching with the other probe — Speaker 2
  • 15:24Lateral dissection defines the anterior plane in posterior sagittal approach — Mark
  • 19:29In absent vagina situations, the urethra is always found to be quite big — Mark
  • 20:53There is typically a thick wall between rectum and urethra in absent vagina situations — Mark
  • 26:26The distal rectum has value for continence in patients with good potential for bowel control — Mark
  • 23:30Neovaginal reconstruction timing depends on presence of uterus - if present, connection to outside needed before menstruation — Tony Khoury
  • 24:39Imaging may not be extremely helpful at this age due to very small structures — Mark
  • 25:09Upper vagina is unlikely to be present when lower vagina is absent, though possible — Mark
  • 27:22Would not perform separate EUA in newborn primary anorectal malformation case - would do EUA at time of repair — Mark
  • 12:18Renal workup for this patient was normal — Speaker 2
  • 12:37Patient has good quality sacrum — Mark
  • 14:05In girls without vagina, must be more careful about bladder and urethra during dissection — Speaker 2

Cases discussed

  • 0:02Female infant with anorectal malformation and intraoperatively discovered vaginal agenesis

Points of disagreement

  • 21:48Timing and approach to neovaginal reconstruction
    • Doctor Teitelbaum: Create neovagina now using sigmoid colon via laparoscopic approach. Preserve nice-looking anal canal as anus. Waiting 15-20 years will require working through scar tissue.
    • Mark: Consider using distal rectum as neovagina given its aesthetic quality, but acknowledge it has continence value. Alternatively, complete rectal repair and defer vaginal reconstruction.
    • Tony Khoury: Need more information before deciding. Must determine if müllerian structures present - if uterus exists, connection needed before menstruation. Timing depends on anatomy.
  • 24:00Whether to proceed with case or stop for further workup
    • Tony Khoury: From trainee perspective, should stop case and obtain proper imaging (MRI or complex ultrasound) before proceeding.
    • Mark: Would quit or do diagnostic laparoscopy. Imaging not extremely helpful at this age due to small structures. Diagnostic laparoscopy more informative.

Open questions

  • Does the patient have müllerian structures (uterus, upper vagina)?
  • Should neovaginal reconstruction be performed now or deferred?
  • If neovagina created now, should distal rectum be used or sigmoid colon?
  • What imaging modality would best assess for upper vaginal structures in an infant?
  • At what age should definitive vaginal reconstruction be performed if deferred?
This episode was analyzed and enriched by Kai, the Library's AI content creator. Every item links to the moment it comes from — click a timestamp to listen in context.

Intraoperative Discovery of Absent Vagina During Newborn Posterior Sagittal Anorectoplasty

The episode's teaching points arranged as a structured lesson, building from the basics up to the finer points. Written by Kai from the episode transcript and reviewed before publishing.

For trainees · Teaching arc · AI-written, human-reviewed

Positioning and preparation anticipate the unexpected

Total body prep from nipples to toes is performed in the supine position before flipping the patient prone over a bump 2:06. The Foley catheter is placed supine, then the patient is repositioned 2:21. This approach allows securing retraction devices to the drapes and permits flipping back if anatomy proves more complex than anticipated 2:06 2:21 — a setup that proves its value when the expected vaginal opening is absent at examination under anesthesia.

Lateral dissection establishes the anterior boundary

In the posterior sagittal approach, clean lateral planes define where the anterior plane must be 15:24. Rather than dissecting directly anterior and risking injury to structures you have not yet identified, work side to side on the rectum 15:24. In a girl without a vagina, the bladder and urethra lie closer than usual to your dissection field 14:05. The urethra in absent vagina malformations is characteristically enlarged 19:29, and a thick wall typically separates the rectum from the urethra 20:53. These anatomic shifts mean the margin for error narrows 19:29 20:53 14:05 — what would be a safe anterior dissection in a typical vestibular fistula becomes a setup for urethral injury here.

Stopping the case is a correct decision

When you encounter anatomy you did not expect — no vaginal opening where one should be — the trainee's instinct to stop and regroup is sound 27:22. Diagnostic laparoscopy at that point offers more information than imaging in an infant this size, where MRI struggles to delineate the uterus and ovaries 3:46 and structures remain too small for reliable ultrasound characterization 24:39. The question that determines timing of neovaginal reconstruction is whether müllerian structures are present 23:30. If a uterus exists, connection to the outside must occur before menarche 23:30. If no uterus is present, reconstruction can wait until the patient is old enough to participate in postoperative dilation 23:30 — typically fifteen to twenty years of age.

The distal rectum has continence value worth preserving

The segment of distal rectum that might be repurposed as a neovagina appears well-formed and lies within the sphincter complex 26:26. In a patient with a good-quality sacrum 12:37 and normal renal workup 12:18 — markers of favorable continence potential — that distal rectum theoretically contributes to bowel control 26:26. Using it as a neovagina sacrifices that contribution 26:26. If neovaginal reconstruction becomes necessary, sigmoid or ileum can be used instead, preserving the native rectum for its intended function 26:26. The decision is not urgent; the anatomy will not become more favorable with time, but neither will it deteriorate. What matters is knowing that the choice exists and what each option costs.

Upper vagina is unlikely when lower vagina is absent

Although an upper vaginal segment could theoretically exist in isolation, it is uncommon when the lower vagina is completely absent 25:09. Laparoscopy will answer the question definitively 27:22. If müllerian structures are present and connected, the reconstruction becomes more complex but also more urgent 23:30. If they are absent, the anorectal repair can proceed in isolation and the question of neovaginal reconstruction deferred until adolescence 23:30, when the patient can participate in the decision and the postoperative care that reconstruction demands.

Cost-effective nerve stimulation uses existing equipment

Rather than a dedicated Peña stimulator, the anesthesia train-of-four box with standard nerve stimulator probes provides equivalent function at far lower cost 8:08. One probe is grounded on wet skin; the other is used to map the sphincter complex 8:35. The technique is identical; only the device differs 8:08 8:35. In a field where equipment costs can limit access to specialized care, knowing that standard anesthesia equipment suffices removes a barrier.

The discussants emphasized that the decision to stop, assess, and plan is not a failure of technique but an exercise of judgment 27:22. The anatomy will wait. The patient's long-term function depends on getting the sequence right, not on completing the case as originally planned.

Takeaways from this story

  • Lateral dissection defines anterior plane in posterior sagittal approach—work side to side, not directly forward
  • Absent vagina means enlarged urethra lies closer to dissection field; anterior dissection carries higher injury risk
  • Stopping for diagnostic laparoscopy when anatomy is unexpected is correct judgment, not hesitation
  • Distal rectum has continence value in patients with good sacrum; preserve it rather than using for neovagina
  • Neovaginal reconstruction timing depends on müllerian structures: if uterus present, connect before menarche

Keywords

anorectal malformation vaginal agenesis absent vagina posterior sagittal anorectoplasty cystoscopy diagnostic laparoscopy neovaginal reconstruction examination under anesthesia

Hashtags

#PediatricSurgery #AnorectalMalformation #LiveSurgery #ColorectalSurgery

Transcript

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