Endometriosis Diagnostics and Treatment
Diagnosis
Transvaginal ultrasound is now the central first-line diagnostic procedure for endometriosis, replacing the historical requirement for diagnostic laparoscopy in all cases 1. This represents a major shift in diagnostic approach based on the most recent 2025 German-Austrian-Swiss guidelines.
Diagnostic Algorithm
First-line investigations:
- Physical examination focusing on pelvic tenderness, nodularity in the posterior fornix, fixed retroverted uterus, and adnexal masses
- Standard transvaginal ultrasound (TVUS) 2
Second-line investigations when deep endometriosis (DE) is suspected:
- Expanded protocol TVUS performed by expert sonographers, which includes evaluation of uterosacral ligaments, anterior rectosigmoid wall, appendix, diaphragm, and dynamic sliding maneuvers to assess organ mobility 3
- Pelvic MRI with moderate bladder distention and vaginal contrast, particularly useful for deep infiltrating disease and surgical planning 3, 2
Important caveat: Expanded protocol TVUS requires specialized training (learning curve of at least 40 examinations) and is not widely available in the United States 3. Standard pelvic ultrasound has significantly lower sensitivity than expanded protocols 3.
Laparoscopy with histologic confirmation remains the gold standard for definitive diagnosis but is no longer required before initiating treatment in symptomatic patients 1, 2.
Treatment
Primary hormonal therapy is now recommended as the first-choice treatment approach for endometriosis-associated pain, with surgical intervention reserved for specific indications 1. This represents the most significant change in the 2025 guidelines.
Medical Management Algorithm
First-line hormonal therapies:
- Combined hormonal contraceptives (CHCs) - continuous or cyclic
- 52mg levonorgestrel-releasing intrauterine system (IUS) 2, 4
Both options show equivalent efficacy for pain control. Choice depends on patient preference, contraindications, and desire for contraception.
Second-line options (after first-line failure):
- GnRH agonists or antagonists
- Progestins (dienogest, norethindrone acetate)
- Aromatase inhibitors (particularly in postmenopausal endometriosis) 5
Critical point: Antigonadotrophic hormonal therapy should NOT be used in patients with endometriosis-related infertility to increase chances of spontaneous pregnancy, even postoperatively 2.
Surgical Management
Indications for surgery:
- Failure of medical management
- Severe or multiorgan involvement
- Infertility with documented endometriosis
- Ovarian endometriomas affecting fertility
- Suspicion of malignancy
Surgical approach:
- Laparoscopy is the recommended approach (not laparotomy) 2
- Complete excision of visible lesions provides better long-term outcomes than ablation alone
- Surgery offers superior results compared to medical therapy alone for pain relief 6
Postoperative management:
- CHC or 52mg levonorgestrel-releasing IUS is recommended as first-line treatment when pregnancy is not desired to prevent recurrence 2, 4
- Postoperative hormonal suppression significantly prolongs recurrence-free intervals 7
Special Populations
Infertility patients:
- Conservative laparoscopic surgery may improve spontaneous conception rates in selected patients 7
- Fertility preservation options (oocyte/embryo cryopreservation) must be discussed before surgery for ovarian endometriomas 2
- Medical therapy does not improve fertility outcomes
Postmenopausal women:
- Combined estrogen-progestogen therapy or tibolone preferred over estrogen-only HRT due to recurrence/malignancy risk 5
- Aromatase inhibitors show most promise for symptomatic postmenopausal endometriosis 5
Multidisciplinary Approach
When to convene multidisciplinary team:
- Failure of initial treatment
- Disease recurrence
- Multiorgan involvement (bowel, bladder, ureter)
- Complex deep infiltrating endometriosis 2
Team should include gynecologic surgeons, colorectal surgeons, urologists, pain specialists, radiologists, and mental health professionals.
Common Pitfalls
- Do not perform systematic preoperative hormonal therapy solely to prevent surgical complications - there is no evidence base for this practice 2
- Do not delay imaging before surgery - preoperative imaging reduces morbidity, mortality, and need for repeat surgeries by enabling complete excision at first operation 3
- Do not assume symptom severity correlates with disease stage - minimal endometriosis can cause severe pain, while extensive disease may be asymptomatic 6
- Do not use standard pelvic ultrasound alone to rule out deep endometriosis - expanded protocol or MRI is required for adequate assessment 3