Pathophysiology and management of endometriosis.

Endometriosis is a common disease that affects up to 5 million women in the United States. Specifically the prevalence of endometriosis is 1 in 15 (7%) women of reproductive age, and there is an associated incidence of infertility in as many as 30% to 40% of cases. The precise physiologic mechanism for the development of endometriosis lesions in the pelvis and abdominal cavity has not been elucidated. Substantial evidence exists, however, that endometriosis is dependent on estrogen for continued growth and proliferation. Therefore, suppression of the hypothalamic-pituitary-ovarian axis with analogues of a gonadotropin-releasing hormone is being increasingly undertaken. Since the most effective resolution of endometriosis occurs after oophorectomy or onset of menopause, the hypoestrogenic state induced by GnRH analogues is of major significance for patients with active disease. Medical therapy for endometriosis is often used as primary therapy for symptomatic disease or as an adjunct to surgical management of pelvic pain or infertility.