All information is based on current medical research (2018–2026). Written specifically for patient education by Dr. Antonio Gargiulo. This article does not replace a consultation with your gynecologist or healthcare provider.
The Decision That Changes Everything
If you have endometriosis and you are considering surgery, one decision matters more than almost any other you will make about your care: who holds the instruments. Population-scale data show that surgeon volume and characteristics are strongly and independently associated with postoperative complications, fertility outcomes, and the risk of needing another operation [^1]. Not which hospital brand is on the door, not whether the robot in the room is the newest model — who, specifically, is operating on you, how many endometriosis surgeries they do a year, and what technique they use.
This may sound obvious. It is not, in practice. In a nationwide Canadian population cohort of 83,787 women who had endometriosis surgery between 2002 and 2018, roughly 80% were operated on by a low-volume surgeon — someone who did fewer than seven endometriosis cases in the year before their operation [^1]. In that same study, the highest-volume surgeons had significantly fewer complications, referred more patients for fertility care, achieved higher live-birth rates, and — most striking — cut the repeat-surgery rate almost in half (17.8% vs 32.9%) compared with their low-volume colleagues [^1].
That is what this article is about. It is a plainly-stated guide to the small number of things that actually move the needle: the technique, the surgeon, the center, and the questions that separate a good outcome from a lifetime of re-operations — all framed by the 109 evidence-based recommendations in the current ESHRE endometriosis guideline [^2].
# A brief word about who is writing this
I trained at Harvard in reproductive medicine and gynecologic surgery, and I hold two board certifications that rarely appear on the same physician’s wall: Reproductive Endocrinology and Infertility, and the Focused Practice Designation in Minimally Invasive Gynecologic Surgery. That combination matters for the discussion below — particularly for endometrioma and fertility-preserving surgery — because most surgeons who operate on endometriosis are not fertility specialists, and most fertility specialists do not operate at the complexity level needed for deep disease. I have been the first benign robotic gynecologic surgery specialist in New England and one of the first robotic reproductive surgeons in the world, with several thousand robotic cases performed since 2006 — well past the volume and learning-curve thresholds documented in the literature discussed below [^1][^3]. For nearly three decades I also served as a surgical faculty member at Harvard Medical School, where I trained an entire generation of reproductive surgeons — which is relevant here only because when I describe what good endometriosis surgery looks like, I am describing the standards I have spent a career teaching. I am telling you all of this so that when I make strong claims in this article, you know the perspective they come from.
Excision, Not Ablation
The first, and possibly most consequential, technical decision in endometriosis surgery is whether the disease is excised (cut out completely, so a pathologist can examine the specimen) or ablated (burned, coagulated, or lasered off the surface, leaving what is underneath). To the patient in a consultation, “we will remove the endometriosis” can mean either. Head-to-head randomized evidence shows it should mean excision [^4].
The best placebo-controlled evidence we have that endometriosis surgery works at all comes from a 2004 randomized crossover trial by Abbott and colleagues, in which women received either full excisional surgery or a diagnostic-only “placebo” laparoscopy: 80% of the excision group reported symptomatic improvement, versus 32% after the placebo procedure [^5]. That trial also documented what most surgeons see clinically — untreated endometriosis progresses in a meaningful minority of women (45% of cases showed progression at second look) [^5].
A 2017 systematic review and meta-analysis of the three randomized head-to-head trials of excision versus ablation showed excision produced significantly greater reduction in dysmenorrhea, dyschezia (pain with bowel movements), and overall chronic pelvic pain at 12 months [^4]. Healey’s 5-year randomized double-blind follow-up added the durability point: dyspareunia (painful intercourse) was significantly better controlled by excision, and more women in the ablation arm were still on medical treatment at 5 years — which is a fair way of saying their surgery did not solve the problem [^6].
The rationale is not mystical. Ablation only treats what the surgeon can see on the surface; endometriosis characteristically extends into tissue that has to be excised to be removed, which is why the same trials that favor excision also found that more women in the ablation arm were still on medical treatment years later [^6]. If someone offers you laser ablation as definitive treatment for anything more than the most superficial peritoneal disease, ask why.
# A word on the instrument
Excision is also a cutting problem: whatever tool you use has to remove diseased tissue without damaging the healthy tissue millimeters away — the ureter, the ovarian cortex, the bowel serosa, the pelvic nerves. Most surgeons default to monopolar or bipolar electrosurgery for cutting, and both spread thermal energy laterally into surrounding tissue — which matters because postoperative complications after deep endometriosis surgery still include fistula, anastomotic leak, and ureteric injury at meaningful rates even in expert hands [^7].
My own preferred cutting instrument is the flexible CO₂ laser fiber — a laser “knife” that delivers a precise incisional beam through the robotic platform with minimal lateral thermal spread. It is not a magic wand. But it lets me excise disease off the ovarian surface, off the ureter, and off the bowel wall with a much narrower margin of collateral thermal injury than electrosurgery permits. Given that ovarian reserve declines significantly and irreversibly after cystectomy in most patients [^8], that margin is not a small detail. When you interview a surgeon, ask what they cut with, and why.
The Surgeon is the Treatment
There is no shortage of gynecologists willing to operate on endometriosis. There is a serious shortage of gynecologists who do it well — and the majority of endometriosis operations are still being performed by low-volume surgeons, roughly 80% in the largest population cohort available [^1]. That gap between availability and expertise is the single biggest structural problem in this field.
Surgeon volume matters, and the effect is not subtle. The Bougie 2025 population cohort of 83,787 patients found significantly reduced complication risk among high-volume surgeons compared with low-volume surgeons (adjusted hazard ratio 0.84, 95% CI 0.74–0.96), higher rates of appropriate fertility referral, higher live-birth rates, and — the outcome you should care about most — a repeat-surgery rate of 17.8% for patients of high-complex-volume surgeons versus 32.9% for patients of low-volume surgeons [^1]. A repeat operation is not a minor event. Each subsequent surgery is harder, has worse adhesions, more anatomical distortion, and less to give.
My own surgical practice sits well past every one of the volume thresholds discussed here. As one of the earliest adopters of robotic gynecologic surgery worldwide — the first benign robotic gynecology specialist in New England, with several thousand robotic cases since 2006 — I have had two decades to move well beyond the learning curves that the Carmona and Vidal studies describe. That does not make me the only good option, and it does not make me right for every patient. It does mean that when I describe what a properly-done endometriosis operation should look like, I am describing something I actually do, not a theoretical standard [^3][^9].
Center volume also matters. A 2026 French nationwide population-based study of 15,364 posterior deep infiltrating endometriosis operations identified an optimal cut-point at 40 hospital stays per year: centers below that threshold had a severe complication rate of 5.3%, versus 3.6% at higher-volume centers — a statistically significant reduction after multivariable adjustment (adjusted odds ratio 0.83, 95% CI 0.70–0.99) [^10]. A 2018 French multicenter study of 1,135 colorectal endometriosis operations came to the same conclusion by different route: the optimal cut-off for colorectal endometriosis surgery was 20 procedures per center per year and 7–13 per surgeon per year, with volume being the only variable independently correlated with complication outcomes on multivariate analysis [^11].
Learning curves are real and quantifiable. Carmona’s classic 2009 study of the first 60 consecutive rectovaginal endometriosis operations by a single surgeon showed that after 30 cases the operating time, blood loss, incomplete-removal rate, and — critically — recurrence rate all dropped significantly [^3]. Thirty operations, in other words, is roughly the minimum experience below which a surgeon should not be doing rectovaginal endometriosis at all. Very few community gynecologists have done thirty. Most have done zero.
What “high-volume” actually looks like in practice. In the Bougie study, “highest volume” was defined as 24 or more endometriosis cases in the previous year [^1]. That is roughly one case every other week — a threshold most obstetrician-gynecologists in general practice will never reach because they are also delivering babies, doing routine hysterectomies, and staffing an office. Endometriosis surgery is a specialty within a specialty, and treating it as an occasional add-on to a general OB/GYN practice is one of the reasons so many women end up on their second or third operation.
The Endometrioma Problem — Where Skill Really Matters
An endometrioma is an ovarian cyst formed by endometriosis. Removing one badly is one of the fastest ways in gynecology to destroy a young woman’s future fertility, and it happens all the time.
A 2012 systematic review and meta-analysis pooled eight prospective cohort studies and found a statistically significant, clinically meaningful fall in serum anti-Müllerian hormone (AMH, the standard marker of ovarian reserve) after ovarian cystectomy for endometrioma — pooled weighted mean difference −1.13 ng/mL [^12]. A 2025 retrospective audit tracking AMH over an average of 23 months after cystectomy showed the drop is not a temporary post-surgical dip that recovers: AMH fell from 2.60 to 1.37 ng/mL at 6 months and continued down to 1.13 ng/mL at final follow-up, with bilateral cystectomy patients losing 72% of their AMH compared with 39% loss for unilateral [^8]. The damage does not reverse.
Why does this happen? Because ovarian tissue is not a bag that a cyst sits inside — it is diffuse, and a formal cystectomy inevitably strips away normal cortex containing primordial follicles along with the endometrioma wall, an effect worse in bilateral cases where the AMH drop can exceed 70% [^8]. In inexperienced hands, the stripping is aggressive, hemostasis is achieved with generous bipolar electrocoagulation of the ovarian bed, and the ovary is thermally injured on top of being physically depleted. This is not an unavoidable feature of the surgery. It is a feature of rushed surgery.
Alternatives exist. Techniques such as combined cystectomy with ablation, careful sharp dissection with plane preservation, sutured hemostasis instead of electrocoagulation of the ovarian bed, and, in select cases, drainage-and-ablation rather than formal cystectomy can substantially reduce the ovarian damage [^8]. This is also where the CO₂ laser knife I referred to earlier earns its place: on the ovarian surface, a beam with minimal lateral thermal spread lets you separate an endometrioma from healthy cortex with much less collateral injury than a bipolar instrument can offer. These techniques require a surgeon who understands the fertility stakes and takes the time. A general gynecologist doing an occasional endometrioma at the end of the operating list is not, in most cases, that surgeon.
This section, more than any other in this article, is why my dual board certification matters clinically. I am boarded in Reproductive Endocrinology and Infertility — the specialty whose entire focus is protecting and using ovarian reserve — and in the Focused Practice Designation in Minimally Invasive Gynecologic Surgery, which is the certification that specifically credentials complex laparoscopic and robotic pelvic surgery. Given that the AMH drop after cystectomy is significant, progressive, and worse in bilateral cases [^12][^8], that combination is not a marketing point — it is the exact intersection an endometrioma patient of reproductive age should be looking for: a surgeon who thinks about your AMH the way a fertility specialist thinks about it, in the same operating room where the endometrioma is being removed.
If you are of reproductive age with an endometrioma, the questions you must ask before consenting are: (1) Will you check my AMH before and after? (2) What technique will you use to preserve my ovarian cortex? (3) Are you willing to leave a portion of the cyst wall adherent to the vascular hilum rather than avulse it, given that the postoperative AMH decline does not recover over time [^8]? (4) Have you counseled me about fertility preservation before this operation? If those questions are met with impatience or generic reassurance, you are with the wrong surgeon.
Deep Disease Belongs in a Multidisciplinary Center
Deep infiltrating endometriosis — the form that invades the bowel wall, ureter, bladder, or the deep parametrium — is a fundamentally different operation from superficial peritoneal disease. The nationwide French data show it carries a severe (Clavien-Dindo III–V) complication rate on the order of 4–5% even at competent centers [^10]. It must be treated as major surgery.
What a serious center produces. In Khazali’s prospective series of 244 consecutive patients undergoing radical laparoscopic excision of deep infiltrating endometriosis at a tertiary referral center, major postoperative complications occurred in 1.2% and minor complications in 11.1%, with a laparotomy conversion rate of 1.6% — and this was in a population where 80% had stage IV disease and joint operating with colorectal and/or urological colleagues was needed in nearly 30% of cases [^13]. Ceccaroni’s 703-patient series using bowel-shaving as the terminal step of radical excision reported reoperation for complication in 2.4%, rectovaginal fistula in 0.3%, and an overall symptomatic recurrence rate of 6.5% at a median 14 months [^14].
Numbers like those are unattainable outside a dedicated multidisciplinary center. In Khazali’s tertiary-center series, joint operating with a colorectal or urological colleague was needed in nearly 30% of cases [^13]. They require a gynecologic surgeon with hundreds of deep-endometriosis cases behind them, a colorectal surgeon who does bowel endometriosis regularly, a urologist prepared to reimplant a ureter if needed, an anesthesia team familiar with long complex pelvic cases, and a pre-operative imaging service capable of accurate disease maps.
The choice of bowel technique itself is not neutral. A 2020 systematic review and meta-analysis of 60 studies compared rectal shaving, discoid excision, and segmental resection for bowel endometriosis: the mean complication rates were 2.2%, 9.7%, and 9.9%, respectively, with rectal shaving significantly less associated with rectovaginal fistula than either discoid excision (OR 0.19) or segmental resection (OR 0.26) [^7]. Shaving is not, however, appropriate for every lesion — deep, wide, or full-thickness bowel involvement genuinely needs disc or segmental resection [^7]. The point is that a surgeon who only knows one bowel technique will overuse it, and a surgeon who cannot do bowel endometriosis at all should not be operating on deep disease without a colorectal colleague scrubbed alongside them.
Centralization improves outcomes. A 2026 Finnish study of centralization at the Oulu University Hospital showed that after care was consolidated, referrals from secondary hospitals tripled, preoperative MRI use doubled from 24% to 49%, complex surgery was 5–6 times more often planned and performed by a multidisciplinary team, and pre- and postoperative hormonal treatment was much more consistently applied [^15]. Better decisions, more accurate imaging, and coordinated care add up. The ESHRE 2022 guideline recommends this model for complex disease and offers 109 evidence-based recommendations to structure it [^2].
Repeat Surgery is a Warning Signal — About the First Surgery
If you have already had one endometriosis operation and your symptoms have come back, the temptation is to interpret this as endometriosis being a mysterious recurring disease that no one can control. The reoperation literature estimates the cumulative probability of pain recurrence after conservative endometriosis surgery at 20–40% and the probability of a further operation at 15–20%, likely underestimates given publication bias [^16]. Sometimes recurrence is biological. Often, it is not.
Incomplete first surgery is a common, correctable cause of “recurrence.” Vercellini’s synthesis of the reoperation literature estimated the cumulative probability of pain recurrence after conservative endometriosis surgery at 20–40%, and the probability of a further surgical procedure at 15–20%, noting that these figures are likely underestimates because of study design limitations [^16]. Even in the hands of a single very experienced surgeon performing complete excision on 1,092 patients, the probability of requiring a repeated surgery reached 3% at 1 year, 11% at 3 years, and 28% at 10 years [^17]. Some recurrence is genuinely biological. But when repeat operations are happening at 3, 5, and 10 years after an initial surgery that was described as “everything was removed,” it is worth asking whether everything actually was.
The referred-out patient has better outcomes. Studies of women referred to minimally invasive gynecologic surgery specialists after prior incomplete endometriosis surgery consistently show that a properly executed second operation identifies residual disease that was not treated the first time [^18]. That is the polite way of putting it. The blunt way is that many “recurrences” are unrecognized persistences.
If you are being counseled for a second or third operation, the question is whether the person recommending it is the same person who did the first one — and whether they have any incentive to admit their first operation might have been incomplete. Given that high-complex-volume surgeons cut the repeat-surgery rate by almost half [^1], a second opinion at a specialist center is not disloyal. It is the standard of care.
What to Ask Before You Consent
Before you sign a consent form for endometriosis surgery, you have every right to ask specific questions and to expect specific answers.
Volume and experience — asked because volume is one of the few variables independently associated with better outcomes on multivariate analysis [^11]:
- How many endometriosis surgeries do you personally do per year? (Look for a number, not a category. Fewer than 20 is a concern for anything beyond very superficial disease.)
- What percentage of your surgical practice is dedicated to endometriosis?
- Do you exercise or ablate, and for which cases?
Imaging and planning — preoperative MRI use roughly doubles when care is centralized in a proper endometriosis center [^15]:
- Have I had a high-quality transvaginal ultrasound or MRI, and did you review it?
- What is your plan if you find bowel, bladder, or ureter involvement I did not know about? (The right answer includes a named colorectal surgeon and/or urologist available on the day.)
Endometrioma-specific — the pooled meta-analytic evidence shows a significant, clinically meaningful drop in postoperative AMH after cystectomy [^12]:
- If I have an ovarian endometrioma, what technique will you use to preserve ovarian reserve? Will you check my AMH before and after? Have you discussed fertility preservation with me?
Center and team — the current threshold with the strongest population-based evidence is 40 posterior deep-endometriosis operations per year at the hospital level [^10]:
- Does this hospital do at least 40 deep endometriosis operations per year? Is there a multidisciplinary meeting where complex cases are discussed?
- Who will follow me postoperatively — you personally, or a resident? Who calls me about the pathology report?
Honesty:
- What is your personal complication rate? Your reoperation rate?
- If my case is beyond your usual practice, will you refer me? To whom?
A surgeon who welcomes these questions is a surgeon who is comfortable with the answers. Given that the number of endometriosis cases a surgeon has done is one of the few variables that independently predicts your outcome [^1], a surgeon who deflects or says “you shouldn’t be worrying about numbers” is telling you something important. Listen.
A Note on Second Opinions
Every woman with endometriosis is entitled to a second opinion, and most should get one before major surgery. The point is not to shop for the answer you want; it is to hear how a different expert conceptualizes your disease, plans the operation, and talks about complications and outcomes. Given how strongly outcomes track surgeon and center experience [^1][^10], an independent expert opinion is not a courtesy — it is one of the highest-yield things you can do for yourself.
I have never in my career seen a good surgeon become angry that a patient sought another opinion. The reaction to the request itself will tell you a great deal about the surgeon.
Continue reading: “Endometriosis and Adenomyosis: Two Diseases, One Patient” — how these two conditions overlap, why they are often missed together, and what it means for your care.
Sources We Used
So You Can Read Them, Question Them, and Decide for Yourself
We believe that informed patients are empowered patients. In an age where artificial intelligence and open-access science place original research within reach of anyone, you have every right to go to the source, read it yourself, and form your own conclusions. Patient education on this website is taken seriously: we do not simplify at the cost of truth, and we do not ask you to take our word for it.
Every statement in this article carries two layers of accountability. It has been filtered through the critical eye of Dr. Antonio Gargiulo, drawing on four decades of clinical and surgical experience in reproductive medicine and advanced gynecologic surgery. And it is independently traceable to a peer-reviewed scientific publication, listed below with its full reference and digital identifier.
[^1]: Bougie et al., 2025. Impact of surgeon characteristics on endometriosis surgery outcomes. Journal of minimally invasive gynecology.
[^2]: Becker et al., 2022. ESHRE guideline: endometriosis. Human Reproduction Open.
[^3]: Carmona et al., 2009. Does the learning curve of conservative laparoscopic surgery in women with rectovaginal endometriosis impair the recurrence rate?. Fertility and Sterility.
[^4]: Pundir et al., 2017. Laparoscopic Excision Versus Ablation for Endometriosis-associated Pain: An Updated Systematic Review and Meta-analysis. Journal of minimally invasive gynecology.
[^5]: Abbott et al., 2004. Laparoscopic excision of endometriosis: a randomized, placebo-controlled trial. Fertility and Sterility.
[^6]: Healey et al., 2014. To excise or ablate endometriosis? A prospective randomized double-blinded trial after 5-year follow-up. Journal of minimally invasive gynecology.
[^7]: Bendifallah et al., 2020. Surgical outcomes after colorectal surgery for endometriosis: Systematic Review and Meta-Analysis. Journal of minimally invasive gynecology.
[^8]: Hanekom et al., 2025. Retrospective Audit: The Irreversible Change in Ovarian Reserve After Formal Cystectomy for Ovarian Endometrioma. Current Women s Health Reviews.
[^9]: Fabien et al., 2020. Spontaneous pregnancy rate following surgery for deep infiltrating endometriosis in infertile women: the impact of the learning curve. Journal of Gynecology Obstetrics and Human Reproduction.
[^10]: Pivano et al., 2026. Association between surgical volume and postoperative complications following posterior deep infiltrating endometriosis surgery: A nationwide population-based study. American Journal of Obstetrics and Gynecology.
[^11]: Bendifallah et al., 2018. Impact of hospital and surgeon case volume on morbidity in colorectal endometriosis management: a plea to define criteria for expert centers. Surgical Endoscopy.
[^12]: Raffi et al., 2012. The impact of excision of ovarian endometrioma on ovarian reserve: a systematic review and meta-analysis. Journal of Clinical Endocrinology and Metabolism.
[^13]: Khazali et al., 2019. Laparoscopic excision of deeply infiltrating endometriosis: a prospective observational study assessing perioperative complications in 244 patients. Archives of Gynecology and Obstetrics.
[^14]: Ceccaroni et al., 2021. “The Sword in the Stone”: radical excision of deep infiltrating endometriosis with bowel shaving—a single-centre experience on 703 consecutive patients. Surgical Endoscopy.
[^15]: Koivurova et al., 2026. Effects of centralized multidisciplinary surgical endometriosis care: a retrospective 3-year follow-up cohort study. BMC Women’s Health.
[^16]: Vercellini et al., 2009. Repetitive surgery for recurrent symptomatic endometriosis: what to do?. European Journal of Obstetrics, Gynecology, and Reproductive Biology.
[^17]: Roman et al., 2023. Long-term risk of repeated surgeries in women managed for endometriosis. A 1,092 patient-series. Fertility and Sterility.
[^18]: Dmello et al., 2018. Referral to a Minimally Invasive Gynecologic Surgeon Following Incomplete Surgical Treatment of Endometriosis: Outcomes of Repeat Surgery. Journal of minimally invasive gynecology.