Peritoneal Pull-Through Vaginoplasty¶
A hybrid technique that extends a Penile-Inversion Vaginoplasty canal with a flap of peritoneum — the thin serous membrane lining the abdominal and pelvic cavities. Pioneered as a gynecologic procedure by Davydov in 1969 for vaginal agenesis, adapted to trans care from roughly 2017 onward, and the most rapidly-evolving trans vaginoplasty technique in 2026.
The trade is straightforward: deeper canal, self-lubricating apex, and substantially less donor-site hair-removal work, paid for with intra-abdominal access, longer OR time, and a complication profile that adds bowel, bladder, and ureteric injury risk on top of standard vaginoplasty risks.
This page covers peritoneal-specific mechanics. Neoclitoris construction, urethral shortening, and labial design live on Penile-Inversion Vaginoplasty; donor-site preparation on Pre-Op Hair Removal; aftercare on Recovery & Dilation.
Origin: from Davydov to trans care¶
The Davydov colpopoiesis was described by Soviet gynecologist Nikolai Davydov in 1969 for cisgender women with Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome — congenital vaginal agenesis. Peritoneum from the rectovesical pouch (cul-de-sac of Douglas) is mobilized through a perineal opening, sutured to the introitus, and the upper edge purse-stringed closed at the pelvic brim to form the vaginal apex.
Long-term MRKH outcomes — durable canals, retained sexual function, low stenosis past 5 years (Templeman et al., Fertil Steril 2007; Giannesi et al., Hum Reprod 2005) — made the technique attractive for trans adaptation. The trans operation is rarely "pure Davydov": most variants combine peritoneum with penile and/or scrotal inversion for the introital portion. Names — peritoneal pull-through vaginoplasty (PPV), peritoneal flap vaginoplasty, robotic/laparoscopic peritoneal vaginoplasty — are used interchangeably.
What the peritoneal flap actually is¶
The peritoneum is a thin (sub-millimeter), translucent, vascularized, mesothelium-covered serous membrane. The surgeon harvests parietal peritoneum from the rectovesical pouch — the dependent space behind the bladder and in front of the rectum. Anterior and/or posterior flaps are raised (off the bladder dome and off the anterior rectum), advanced caudally toward the perineum, and sutured end-to-end to the inverted penile/scrotal skin tube being elevated from below. The result is a hybrid canal: skin at the introitus and lower canal, peritoneum at the upper canal and apex. The proximal peritoneal end is purse-stringed shut, mimicking the cisgender vaginal apex.
Peritoneum is mesothelium, not mucosa
Peritoneum produces serous transudate continuously to lubricate sliding viscera. It is not the same tissue as cisgender vaginal epithelium and does not respond to arousal. Patients consistently report less daily lubricant need than inversion-only canals, but penetration still typically requires added lubricant.
Laparoscopic vs robotic access¶
PPV requires intra-abdominal entry, which is the central technical departure from pure inversion.
| Access | Setup | Suturing | Used by | Trade |
|---|---|---|---|---|
| Laparoscopic | 4–5 ports, 12–15 mmHg CO2 pneumoperitoneum, rigid tools | Intracorporeal suturing of peritoneum to skin tube is technically demanding | UCSF (Garcia, Jacoby), several US groups | Lower disposable cost; harder learning |
| Robotic (da Vinci Xi) | Same port count, wristed instruments | Triangulation in the deep pelvis significantly easier; faster, more reproducible suturing | Amsterdam UMC (Bouman, van der Sluis), high-volume US centers | Higher console/disposable cost; faster OR after the curve |
Reported learning curves run 20–40 cases to proficiency. Many programs use a combined-team model — urology/plastics perineal, gyn-onc/colorectal abdominal — which adds OR time but spreads the curve. Solo dual-trained surgeons (Jacoby, Bouman) exist but are uncommon. Most series report similar major-complication rates between laparoscopic and robotic access; the comparison has not been formally randomized.
Hybrid vs standalone-peritoneal¶
Almost all trans PPV in 2026 is hybrid — peritoneum plus inversion — rather than pure-Davydov. The patterns:
| Variant | When used | Canal lining |
|---|---|---|
| Inversion + peritoneal extension | Standard inversion performed; depth judged inadequate intraoperatively → peritoneum mobilized to extend the apex | Skin in lower 2/3, peritoneum at apex |
| Planned hybrid | Peritoneum planned from the start to form the upper third to half of the canal | Skin at introitus and lower canal, peritoneum above |
| Peritoneal-only (rare) | Severely insufficient donor skin: prior orchiectomy with scrotal contracture, prior failed vaginoplasty, congenitally limited tissue | Peritoneum throughout; introitus from labial/local flaps |
| Revision peritoneal | Stenosis or shortening after prior inversion vaginoplasty; canal opened, scar resected, peritoneum brought down to lengthen | Original tissue + new peritoneal extension |
The Amsterdam (Bouman) default is planned hybrid. Most US programs default to inversion-with-peritoneal-extension and convert intraoperatively. Several high-volume centers report revision as their largest peritoneal indication by case volume.
Depth¶
Depth is the headline advantage of PPV.
| Approach | Intraoperative depth | 6-month depth (post-contraction) |
|---|---|---|
| Inversion alone | 10–14 cm (up to ~15) | 9–13 cm |
| Inversion + peritoneal extension | 14–17 cm | ~15–16 cm |
| Robotic peritoneal (Bouman/Amsterdam) | ~15 cm mean | ~14 cm mean |
| Laparoscopic peritoneal (Jacoby/UCSF) | ~15 cm | ~13–14 cm |
Depth is bounded by the pelvic brim — peritoneum cannot be pulled above the sacral promontory without entering bowel territory. A deep, narrow male pelvis yields less length than a shallower pelvis. Very thin patients have less peritoneal mobility; very obese patients face port and visualization difficulty. Across modern series, depth gain of 3–5 cm over inversion-only is the consistent headline number.
Self-lubrication: what it does and doesn't mean¶
Once relocated and re-vascularized in the canal, peritoneal mesothelium continues to secrete serous transudate.
- Reduced lubricant dependence for penetration. Inversion-only canals produce essentially no fluid; peritoneal canals are noticeably better in patient-reported outcomes.
- Not equivalent to cisgender physiology. Cisgender arousal lubrication is plasma transudate from vaginal epithelium driven by parasympathetic vasocongestion, plus Bartholin/Skene secretions. Peritoneal transudate is continuous, low-volume, and not arousal-coupled — it doesn't increase with stimulation.
- Chronic mucus discharge in 50–80% of patients: light, generally clear, odorless, a few mL/day. Liner use is typical. Volume often settles over 12–24 months; some patients report it never fully resolves. No standardized management regimen.
- Near-neutral pH (~7.0) vs the acidic cis vagina (~3.8–4.5). Microbiome is mixed enteric/skin flora rather than lactobacillus-dominated. Bacterial vaginosis as a syndrome doesn't apply, but anaerobic overgrowth and odor changes occur and respond to hygiene and occasionally metronidazole.
- Endometriosis is theoretically possible since peritoneum is the substrate for ectopic endometrial implantation, but no convincing case reports in trans peritoneal neovaginas exist as of 2026.
Hair-removal burden¶
Because the upper-canal lining is peritoneum (mesothelium, no hair follicles), hybrid PPV reduces but doesn't eliminate the donor-site hair-removal requirement compared to pure inversion. See Pre-Op Hair Removal for technique details.
| Approach | Donor area requiring clearance | Typical timeline |
|---|---|---|
| Pure inversion | Full central scrotum + proximal penile shaft destined to line the canal | 6–18 months pre-op |
| Hybrid PPV | Distal 6–8 cm of penile skin + small scrotal contribution forming the introitus | Often saves 6–12 months |
| Peritoneal-only | Essentially none for canal lining; minimal external work for labia and introitus | Minimal |
This is the most-cited practical advantage for patients who can't tolerate, can't afford, or aren't candidates for extensive laser/electrolysis (e.g. poor hair-skin contrast for laser).
Operative time and hospital stay¶
| Stage | Pure inversion | Hybrid PPV (laparoscopic) | Hybrid PPV (robotic) |
|---|---|---|---|
| OR time | 3–5 h | 6–8 h | 5–7 h post-curve, 9–10 h early |
| Hospital stay | 3–5 days | 4–7 days | 4–7 days |
| Foley catheter | 5–10 days | 5–10 days | 5–10 days |
| Vaginal packing | 5–7 days | 5–7 days | 5–7 days |
| Dilation start | 5–10 days | 5–10 days | 5–10 days |
Added OR time comes from port placement, pneumoperitoneum, flap dissection, and intracorporeal suturing of peritoneum to the skin tube; two-team setups shave 1–2 hours by running abdominal and perineal portions partly in parallel. The added stay is largely abdominal recovery — bowel function (peritoneal entry causes ileus more often than perineal-only surgery), pain control, and observation for delayed bowel or bladder injury. Some surgeons use slightly longer dilator lengths from the start to maintain peritoneal depth; the rest of the dilation schedule matches inversion (see Recovery & Dilation).
Complications specific to peritoneal¶
PPV inherits all the complications of inversion (introital stenosis, granulation, partial flap necrosis, urethral and clitoral issues) and adds abdominal-cavity-entry risk. See Complications & Revision for the full shared complication picture; the table below covers what's specifically added by going intra-abdominal.
Abdominal-entry risks¶
| Complication | Reported rate | Notes |
|---|---|---|
| Bowel injury (rectum/sigmoid) | 1–3% | Most recognized intraoperatively and repaired primarily; missed injuries present at 3–7 days as peritonitis |
| Bladder injury | 1–4% | Peritoneum-off-bladder-dome is a common injury site; usually primary repair + extended Foley |
| Ureteric injury | <1% | Worst long-term morbidity (stricture, hydronephrosis) |
| Major vascular injury at port placement | <0.5% | Similar to other laparoscopic pelvic surgery |
| Incisional hernia at port site | 1–2% | Years-out timeline |
| Trocar-site infection / bleeding | Low | Standard laparoscopic risk |
Peritoneal flap-specific¶
| Complication | Reported rate | Notes |
|---|---|---|
| Partial flap necrosis | 2–6% | Foul discharge + pain at 1–2 weeks; conservative debridement to revisional surgery; risks: smoking, tension, anastomotic hematoma |
| Full flap necrosis | Rare | |
| Anastomotic dehiscence (peritoneum-skin junction) | 3–8% | Usually heals secondarily but can stricture at the junction — a notably hard place to dilate through |
| Mucus discharge nuisance | 50–80% | Not a complication per se; the most common patient-reported nuisance |
| Apex stenosis | Reported | Most common late peritoneal-specific revision indication |
| Apex prolapse / dehiscence | Case reports | Documented in MRKH Davydov literature; rare in trans cohorts; extreme cases involve communication with the peritoneal cavity |
| Pelvic abscess | Case reports | Canal is theoretically continuous with the abdominal cavity until healed; introital infections can track upward |
| Intraperitoneal adhesions | Unquantified | Long-term risk affecting any future abdominal surgery |
Combined major complication rate across modern series runs ~5–10%. Smoking, flap tension, and anastomotic hematoma are the consistently identified modifiable risk factors.
Major published series¶
The trans PPV literature is recent (mostly 2018-onward) and small. Key groups, ordered by approximate publication volume:
Bouman, van der Sluis, Mullender — Amsterdam UMC (robotic)¶
The largest European trans vaginoplasty program. Pioneered robotic-assisted peritoneal in the European trans setting. Amsterdam was historically known for sigmoid (intestinal) vaginoplasty before transitioning much of their volume to peritoneal. Comparative outcome data (inversion vs peritoneal vs sigmoid) reported across multiple papers in J Sex Med and Plast Reconstr Surg between 2016 and 2023 (Bouman, van der Sluis, Buncamper, Mullender et al.).
Garcia, Jacoby, Wittenberg — UCSF and Cedars-Sinai (laparoscopic, then robotic)¶
One of the earliest US laparoscopic peritoneal series. Jacoby (formerly Mt. Sinai, then UCSF) and Garcia (now Cedars-Sinai) have published technique and outcomes papers describing depth gain of 3–5 cm vs inversion-only historical comparison. Jacoby et al. published in J Urol (2019) on robotic Davydov peritoneal flap for vaginal-depth augmentation; Smith, Yuan, Stelmar, Lee, Garcia (Cedars-Sinai, 2022) compared peritoneal pull-through vs standard inversion in a single-surgeon experience.
Other notable groups¶
Dy, Granieri, Bluebond-Langner, and Zhao at NYU run a urology-led robotic peritoneal series with published GAV revision data (J Urol 2021). Peters, Berli, and Dugi at OHSU focus on peritoneal as revision for prior failed inversion. Acar et al. published single-port and multiport robotic Davydov approaches (Urology 2020). Zhao YC and colleagues in Beijing run a large single-center laparoscopic series with attention to flap design and intracorporeal suturing.
Across these series the headline numbers are consistent: 3–5 cm depth gain over inversion, ~5–10% combined major-complication rate, and lubrication satisfaction that is meaningfully but not dramatically better than inversion-only.
Where the technique is still evolving¶
PPV is the most actively-changing trans vaginoplasty technique as of 2026. Open questions: 10+ year durability in trans cohorts (MRKH literature suggests durable, but trans series aren't yet that old); true comparative trials (almost all series are single-center and uncontrolled); robotic vs laparoscopic outcome equivalence; standardized mucus discharge management; peritoneal-only as a primary technique for patients with no usable donor skin; primary peritoneal for pediatric/early-blocker patients with limited penile/scrotal donor tissue from puberty blockade; and consensus on flap design (anterior-only, posterior-only, both-flaps, tube vs patch).
Newer technique, smaller evidence base
PPV has roughly a decade of trans-specific outcome data versus six decades for penile inversion. Early results are encouraging and consistent across centers, but the long-tail durability picture — apex behavior at 15–20 years, adhesion sequelae, mucus evolution — is still being written. Choose a surgeon with documented volume; ask for their own complication numbers, not the literature pooled rate.
What to ask in consult¶
| Question | Why it matters |
|---|---|
| What's your peritoneal case volume and where are you on your learning curve? | 20–40 cases is the typical proficiency threshold; ask for the number. |
| Robotic or laparoscopic? Solo or two-team? | All viable; surgeon should articulate why their setup fits your case. |
| Hybrid (planned) or inversion-with-peritoneal-extension if needed? | Affects pre-op hair removal scope and OR planning. |
| What's your bowel/bladder/ureteric injury rate in your own series? | Pooled literature is 1–4%; their number matters more. |
| How do you manage chronic mucus discharge post-op? | No standard regimen; surgeon should have a protocol. |
| If I need revision, do you do peritoneal revisions yourself? | Apex stenosis and anastomotic strictures are the peritoneal-specific late issues. |
See also Surgeons & Cost for choosing a center and Recovery & Dilation for what the first year looks like.
Sources¶
Foundational gynecologic technique¶
- Davydov SN. "Colpopoiesis from the peritoneum of the uterorectal cavity." Akush Ginekol (Mosk). 1969;45(12):55–57. Original Russian description.
- Templeman CL, Hertweck SP, Levine RL, Reich H. "Use of laparoscopically mobilized peritoneum in the creation of a neovagina." Fertil Steril. 2007.
- Giannesi A, Marchiole P, Benchaib M, Chevret-Measson M, Mathevet P, Dargent D. "Sexuality after laparoscopic Davydov in patients affected by congenital complete vaginal agenesis associated with uterine agenesis or hypoplasia." Hum Reprod. 2005;20(10):2954–2957.
Trans-specific operative series¶
- Jacoby A, Maliha S, Granieri MA, et al. "Robotic Davydov peritoneal flap vaginoplasty for augmentation of vaginal depth in feminizing vaginoplasty." J Urol. 2019.
- Smith SM, Yuan N, Stelmar J, Lee G, Garcia MM. "The peritoneal pull-through technique versus the standard penile inversion technique for vaginoplasty: a single surgeon's experience." Cedars-Sinai, 2022.
- Bouman MB, van der Sluis WB, Buncamper ME, Mullender MG, et al. Amsterdam UMC vaginoplasty outcomes — multiple papers in J Sex Med and Plast Reconstr Surg, 2016–2023, including comparative inversion vs peritoneal vs sigmoid outcomes.
- Bouman MB, van Zuijlen PPM, Buncamper ME, Mullender MG. "Intestinal vaginoplasty revisited: a review of surgical techniques, complications, and sexual function." J Sex Med. 2014. Background — preceded the Amsterdam shift toward peritoneal.
Other groups¶
- Dy GW, Granieri MA, Fu BC, Vyas N, Boczar D, Bluebond-Langner R, Zhao LC. Robotic peritoneal flap revision of gender-affirming vaginoplasty. J Urol, 2021.
- Peters BR, Martin LH, Butler C, Dugi D, Berli JU. Peritoneal flap in gender-affirming vaginoplasty: revision and primary application. OHSU, ~2022.
- Acar O, Sofer L, Dobbs RW, et al. Single-port and multiport approaches for robotic vaginoplasty with the Davydov technique. Urology, 2020.
- Zhao YC et al. Beijing peritoneal vaginoplasty series. Ann Plast Surg / Plast Reconstr Surg, ~2015–2020.
Standards¶
- Coleman E et al. WPATH Standards of Care v8 (2022) — vaginoplasty surgical chapter notes peritoneal as an emerging technique with promising depth and lubrication outcomes.