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Studies:
“Endometriotic lesions have been reported in every part of the female human body and in some instances in males. Organs that are close to the uterus are more often affected than distant locations. Extrapelvic endometriosis affects a slightly older population of women than pelvic endometriosis….The gastrointestinal tract is the most common location of extrapelvic endometriosis with the urinary system being the second one. However, since sigmoid colon, rectum, and bladder are pelvic organs, extragenital pelvic endometriosis may be a more suitable definition for endometriotic implants related to these organs than extrapelvic endometriosis. The sigmoid colon is the most commonly involved, followed by the rectum, ileum, appendix, and caecum. Most lesions are confined in the serosal layer; however, deeper lesion can alter bowel function and cause symptoms. Bladder and ureteral involvement are the most common sites concerning the urinary system. Unfortunately, ureteral endometriosis is often asymptomatic leading to silent obstructive uropathy and renal failure. Surgical excision of the endometriotic tissue is the ideal treatment for all types of extrapelvic endometriosis.
“Pelvic endometriosis usually refers to lesions proximal to the uterus such us the ovaries, the fallopian tubes, the uterine ligaments, and the surrounding pelvic peritoneum. Extrapelvic endometriosis on the other hand, is affecting other areas of the body, including the vagina, vulva, cervix and perineum, the urinary system, the gastrointestinal tract, the thoracic cavity including lung and pleura, extremities, skin, and central nervous system. Nevertheless, the term of extragenital pelvic endometriosis describes in a more accurate way endometriotic lesions involving pelvic organs such as rectum, sigmoid, and bladder.”