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- Endometriosis is a common but potentially painful and debilitating estrogen-dependent gynecologic condition affecting women of predominately reproductive age (1)[A].
- Symptoms and signs generally consist of pelvic pain and decreased fertility.
- Due to estrogen-dependent implants of endometrial tissue found outside the uterus. Although endometriomas have been recorded in liver, bowel, umbilicus, lung, and other tissue, the most common pathologic sites are:
- Peritoneum (bladder, cul-de-sac, pelvic walls, ligaments, and fallopian tubes)
- Rectovaginal septum
- Ectopic endometrial implants proliferate and slough with the menstrual cycle.
- Stage I (minimal) to IV (severe). Staging is useful in therapeutic planning but does not correlate with pain severity.
- Female only
- Affects 11% of fertile women
- Found in 30–50% of infertile women
- Found in 50–60% of women and adolescent women with pelvic pain
Endometriosis may begin with puberty as endometrial implants are dependent on ovarian hormones. This can lead to debilitating pelvic pain and severe dysmenorrhea associated with missed school, social, and family activities.
The presence of endometriosis decreases fecundability from 15–20% per month to 2–10% per month. 25–50% of infertile women have endometriosis. However, pelvic endometriosis generally improves during pregnancy.
Although menopause often results in a resolution of symptoms, pelvic endometriosis may extend into menopause and may be exacerbated by hormone replacement therapy (HRT).
Etiology and Pathophysiology
- Not fully understood; several factors are believed to play a role, including immunologic changes and genetic predisposition in the presence of abnormal proliferating endometrial tissue implants causing chronic peritoneal inflammation.
- Theories include:
- Sampson theory: Retrograde menstruation results in peritoneal implantation and disease.
- Halban theory: Distant disease is probably caused by hematogenous/lymphatic dissemination or metaplastic transformation.
- Coelomic metaplasia: Coelomic epithelium remains undifferentiated in the peritoneal cavity and differentiates to form functioning endometrium.
- Endometrial-associated infertility is multifactorial:
- Pelvic inflammation
- Anatomic disruption of pelvic structures (Involvement of the fallopian tube may cause isthmic tubal obstruction.)
- Proliferation and activation of peritoneal macrophages (may predispose to gamete phagocytosis)
- Alteration in eutopic endometrium
Odds ratio of symptomatic endometriosis with a first-degree affected relative is 7.2. Those with affected first-degree relatives have a 26% chance of severe manifestations versus 12% if no first-degree affected relatives.
- Family history
- Menstruation and ovulation
- Delayed childbirth
- Suppression of heavy menstruation and ovulation with oral contraceptives during adolescence may delay sequelae.
- Some factors are considered protective:
- Fruits, green vegetables, n-3 long-chain fatty acids
- Aerobic exercise may decrease pelvic pain.
- Early diagnosis and treatment might help prevent sequelae.
Commonly Associated Conditions
Associated with increased risks for cancer of the ovary, breast, endometrium; increased risk for cutaneous melanoma, non-Hodgkin lymphoma, autoimmune diseases, asthma, and cardiovascular disease