Extrapelvic endometriosis

Extrapelvic endometriosis is a rare form of endometriosis in which endometrial-like tissue (tissue resembling the lining of the uterus) is found outside the pelvic cavity. While classic endometriosis typically involves the ovaries, fallopian tubes, and pelvic peritoneum, extrapelvic endometriosis can affect a wide range of organ systems including the gastrointestinal tract (bowel, appendix, rectum), urinary tract (bladder, ureters, kidneys), thoracic cavity (lungs, diaphragm — sometimes called thoracic endometriosis or catamenial pneumothorax), abdominal wall (particularly in surgical scars such as cesarean section scars), skin, and rarely the central nervous system or extremities. The condition predominantly affects women of reproductive age. Symptoms of extrapelvic endometriosis vary widely depending on the site of involvement and often follow a cyclical pattern corresponding to the menstrual cycle. Patients may experience chronic pain at the affected site, cyclical bleeding (such as hemoptysis in thoracic endometriosis or hematuria in urinary tract involvement), bowel obstruction, or palpable masses in the abdominal wall. Diagnosis can be challenging due to the diverse and often atypical presentations, frequently requiring imaging studies (MRI, CT, ultrasound) and histological confirmation through biopsy or surgical excision. Treatment approaches include hormonal therapies aimed at suppressing estrogen production and menstruation (such as GnRH agonists, progestins, and combined oral contraceptives), which can help control symptoms and reduce lesion activity. Surgical excision of extrapelvic endometriotic implants is often necessary, particularly for symptomatic masses, bowel or urinary tract obstruction, or thoracic disease causing recurrent pneumothorax. A multidisciplinary approach involving gynecologists, surgeons, pulmonologists, or urologists is often required depending on the organ system involved. There is currently no cure, and recurrence after treatment is possible.

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