Table of Contents
Introduction
Endometriosis is a condition in which the cells that line the uterus grow outside of the uterus in other areas, such as the ovaries. The condition can interfere with a woman's fertility and ability to become pregnant. Endometriosis can also cause severe pelvic pain, especially during menstruation.
Endometriosis is a common gynecological condition. It is a chronic, painful, and often progressive disease in women. However, the causes of endometriosis are unknown, it is widely variable in symptoms and severity, and it is difficult to diagnose.
Endometrial Implants
Endometriosis occurs when cells from the mucous membrane lining the uterus (endometrium) form implants that attach, grow, and function outside the uterus, generally in the pelvic region.
Endometrial cells contain receptors that bind to estrogen and progesterone, which promote uterine growth and thickening. When these cells become implanted in organs and structures outside the uterus, these hormonal activities continue to occur, causing bleeding and scarring.
Endometrial implants vary widely in size, shape, and color. Over the years, they may diminish in size or disappear, or they may grow.
- Early implants are usually very small and look like clear pimples.
- If they continue to grow they may form flat injured areas (lesions), small nodules, or cysts called endometriomas, which can range from sizes smaller than a pea to larger than a grapefruit.
- Implants also vary in color; they may be colorless, red, or very dark brown. These so-called chocolate cysts are endometriomas filled with thick, old, dark brown blood that usually appear on the ovaries.
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Review Date: 07/26/2010
Reviewed By: Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine,
Harvard Medical School; Physician, Massachusetts General Hospital.
Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M.,
Inc.
A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org)
