Category: Bowel Endometriosis

Bowel endometriosis is a form of deep infiltrating endometriosis (DIE) where endometrial-like tissue grows on or within the walls of the bowel, most commonly the rectum, sigmoid colon, and occasionally the small intestine, appendix, or cecum. This condition can cause a wide range of gastrointestinal and pelvic symptoms, often mimicking other disorders like irritable bowel syndrome (IBS) or inflammatory bowel disease (IBD). Because of its complex nature and overlapping symptoms, bowel endometriosis is frequently misdiagnosed or overlooked, delaying effective treatment.

Endometriosis is a chronic condition in which tissue similar to the lining of the uterus (the endometrium) grows outside the uterus, triggering inflammation, scar tissue formation, and adhesions. In the case of bowel endometriosis, these lesions infiltrate the bowel wall, leading to pain, digestive issues, and, in some cases, obstruction. While endometriosis can affect many parts of the body, bowel involvement is one of the most severe manifestations, affecting up to 12% of individuals with endometriosis and often occurring alongside other pelvic or deep infiltrating lesions.

Symptoms of Bowel Endometriosis

The symptoms of bowel endometriosis can be cyclical—worsening during menstruation—or persist throughout the month. This condition is especially tricky to diagnose because it mimics several gastrointestinal and gynecological conditions. Common symptoms include

  • Painful bowel movements, especially during menstruation
  • Constipation or diarrhea
  • Bloating, gas, and abdominal cramping
  • Rectal bleeding (rare, but possible during menstruation)
  • Nausea and vomiting in severe cases
  • Chronic pelvic pain
  • Pain with intercourse (dyspareunia)
  • Fatigue and discomfort affecting daily life

In some cases, bowel endometriosis can cause partial or complete bowel obstruction, which may require urgent medical or surgical intervention. For individuals trying to conceive, bowel endometriosis may also negatively impact fertility due to inflammation, scarring, and anatomical distortion.

Diagnosing Bowel Endometriosis

Diagnosing bowel endometriosis requires a high index of suspicion, especially in individuals with persistent gastrointestinal and pelvic symptoms that worsen around their menstrual cycle. A thorough history, physical examination, and targeted imaging are critical for accurate diagnosis.

  • Transvaginal ultrasound (TVUS) performed by an expert can identify deep infiltrating lesions in the rectovaginal area.
  • Magnetic Resonance Imaging (MRI) is highly useful in mapping the extent of endometriosis, particularly when bowel involvement is suspected.
  • Colonoscopy is generally not effective for detecting endometriosis unless the disease has penetrated the bowel mucosa. However, it may help rule out other conditions like colorectal cancer or IBD.
  • Diagnostic laparoscopy remains the gold standard for confirming the presence of bowel endometriosis and allows for simultaneous surgical treatment.

Treatment Options for Bowel Endometriosis

Management of bowel endometriosis depends on the severity of symptoms, the extent of bowel involvement, and the patient’s reproductive goals. A multidisciplinary team including a gynecologist, colorectal surgeon, and radiologist is often needed for optimal care.

  • Hormonal therapies (like birth control pills, progestins, or GnRH agonists) can suppress endometrial lesion activity and alleviate symptoms but do not eliminate the disease. They are not curative and may not be effective for severe or obstructive bowel lesions.
  • Surgical excision is often required for moderate to severe cases or when medical treatment fails. There are several surgical techniques, including:
    • Shaving of superficial lesions from the bowel surface
    • Disc resection for isolated nodules
    • Segmental resection for full-thickness bowel involvement or multiple lesions

When performed by skilled surgeons, laparoscopic excision of bowel endometriosis can significantly improve pain, bowel function, and fertility outcomes.

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