Endometriosis
A painful condition where tissue similar to the lining of the uterus grows outside the uterus, causing pelvic pain and fertility issues.
Emergency Management: Ruptured endometrioma leading to severe peritonitis. Endometriosis-associated bowel obstruction.
Endometriosis is a chronic, estrogen-dependent inflammatory disorder defined by the presence of endometrial glands and stroma outside the uterine cavity. These ectopic lesions predominantly occur on the pelvic peritoneum, ovaries, and uterosacral ligaments, leading to pelvic pain and infertility.
Detailed Overview
The exact cause is unknown, but Sampson theory of retrograde menstruation is the most widely accepted. The ectopic endometrial tissue responds to cyclic ovarian hormones, causing localized bleeding, inflammation, and fibrosis/adhesions. Endometriosis significantly impacts quality of life through severe dysmenorrhea, deep dyspareunia, and chronic pelvic pain. Diagnosis is often delayed by 7-10 years from symptom onset.
Epidemiology & Demographics
Affects 10% of reproductive-aged women. Prevalence is 30-50% in women with chronic pelvic pain or infertility. Peak incidence is between ages 25-35.
Etiological Mechanism
Multifactorial. Retrograde menstruation (Sampson theory) combined with altered immune clearance allows viable endometrial cells to implant on the peritoneum. Coelomic metaplasia and lymphatic spread are alternative theories for extra-pelvic disease.
Primary Causes
Idiopathic, though heavily influenced by genetic predisposition, immune dysfunction, and estrogen exposure.
Ectopic endometrial tissue contains estrogen receptors and aromatase, allowing local estrogen production that drives tissue proliferation. Unlike normal endometrium, ectopic tissue is resistant to progesterone-induced apoptosis. During menstruation, these lesions bleed locally. Because the blood cannot be expelled from the body, it triggers a robust macrophage-driven inflammatory cascade. This chronic inflammation produces cytokines and prostaglandins, stimulating sensory nerve fibers (causing severe pain). Over time, organized inflammatory exudates lead to dense fibrous adhesions that distort pelvic anatomy (e.g., tethering the ovaries to the bowel), obstructing fallopian tubes and impairing oocyte release, causing infertility. Ovarian implants form cystic collections of old, dark blood known as endometriomas (chocolate cysts).
Diagnostic Criteria & Guidelines
Definitive diagnosis requires surgical visualization (laparoscopy) and histologic confirmation of endometrial glands and stroma. However, empiric medical treatment is usually started based on clinical suspicion without prior surgery.
NSAIDs (e.g., Ibuprofen 600 mg PO Q6H PRN) for pain. Combined Oral Contraceptives (COCs) taken continuously (skipping placebo pills) to induce amenorrhea and suppress lesions. Alternatively, progestin-only pills (Norethindrone 5 mg PO daily) or LNG-IUD (Mirena).
Second-Line & Adjunctive Therapy
GnRH agonists (Leuprolide 3.75 mg IM monthly) or GnRH antagonists (Elagolix 150 mg PO daily) to induce a hypoestrogenic state. Add-back hormone therapy (low dose estrogen/progesterone) is required to prevent bone loss and severe hot flashes if used >6 months.
Surgical & Procedural Management
Laparoscopic excision or ablation of endometriotic lesions and adhesiolysis for pain refractory to medical management or for fertility enhancement. Excision of endometriomas. Definitive surgery (hysterectomy with bilateral salpingo-oophorectomy) is a last resort for severe refractory pain in patients done childbearing.
Patient Counseling & Advice
Acknowledge that her pain is real (validation is crucial due to high rates of medical gaslighting in endometriosis). Explain that medical therapy manages pain but does not cure the disease or improve fertility.
Follow-Up & Monitoring Schedule
Monitor pain scores every 3-6 months after starting therapy. Serial ultrasounds yearly for patients with known, managed endometriomas.
Preventive Strategies
Prolonged use of combined oral contraceptives from an early reproductive age can reduce risk, but primary prevention is not fully established.
A chronic, recurring condition. Symptoms typically regress post-menopause. With appropriate surgical and medical management, 60% of infertile women can conceive.