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Endometriosis of the Appendix

Endometriosis occurs when tissue resembling the endometrium starts to grow outside the uterus. This usually occurs in or around the reproductive organs. However, in rare cases, the disease can spread to other areas such as the bladder, kidneys, lungs, bowels, and appendix.

It is not clear how common endometriosis of the appendix is, and there is great variation in the rate of appendiceal involvement with numbers ranging from 1 to 22%.

endometriosis in appendix
Endometriotic implant on the appendix.

Causes of endometriosis

The exact cause of endometriosis is a mystery. It is also not clear why the disease sometimes spreads to other areas such as the kidneys, diaphragm, or appendix. One hypothesis is retrograde menstruation where the menstrual blood carrying endometrial debris flows backward into the fallopian tubes and subsequently implants and forms lesions.

Other theories include:

  • the coelomic metaplasia theory, which suggests that the peritoneal cavity—or the space within the abdomen that contains the intestines, stomach, and liver—houses progenitor cells or cells capable of differentiating into endometrial tissue in response to a specific signal.
  • the induction theory, which suggests that the endometrium, or uterine lining which is shed during menstruation, produces substances to form endometriosis.
  • the cellular immunity theory, which suggests that alterations in the immune system allow endometrial cells to grow outside the uterus.

Symptoms of endometriosis of the appendix

Appendiceal endometriosis can cause a wide range of symptoms that mimic symptoms of acute appendicitis. These are a sudden pain that begins on the right side of the lower abdomen and that worsens with movement, loss of appetite, nausea, vomiting, abdominal bloating, constipation or diarrhea, and fever. However, unlike acute appendicitis, endometriosis of the appendix usually causes pain that comes and goes with the menstrual cycle.

Patients may also experience:

  • symptoms of acute appendicitis
  • appendiceal invaginations
  • abdominal colic, nausea, and melena, or black stools
  • no symptoms

Diagnosis of endometriosis of the appendix

It is difficult to diagnose endometriosis of the appendix because the symptoms are very similar to those of acute appendicitis.

One of the most important tools in diagnosing the condition I a physical examination. However, imaging techniques such as CT scans can also be useful. The surest method for a definitive diagnosis, however, is laparoscopic surgery.

It is very important to diagnose endometriosis of the appendix early so that patients can receive the treatment they need. If left untreated, appendiceal endometriosis can lead to bleeding or perforation in the intestines and obstruction of the bowels.

Treatment of endometriosis of the appendix

An appendectomy (the surgical removal of the appendix) is the best way to treat appendiceal endometriosis. In more severe cases, an ileocecectomy (the surgical removal of the ileum, a part of the small intestine) or hemicolectomy (the removal of a segment of the colon) may be necessary.

The rate of appendiceal involvement of endometriosis varies greatly, ranging from 1% to as high as 22%. Researchers hypothesize that the way in which the specimen is analyzed could partly explain this wide disparity.

Patient story

Endometriosis Patient

“Being a freshman in college was enough stress, the last thing I needed was this disease bringing me down. Together, Dr. Seckin, my parents, and I decided surgery was the best option. Going in with no guarantee of success I put all my trust in Dr. Seckin knowing I was in good hands. I am happy to say that now, two weeks after my surgery I feel GREAT! Dr. Seckin removed 15 suspicious adhesions and a very fatty, unhealthy, inflamed appendix. Aside from expected soreness from the surgery, I am confident that I am on the right track back to my old self. ” –Anessa Marinello

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Our office is located on 872 Fifth Avenue New York, NY 10065.
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Disclaimer: The information offered on the website is intended to educate users on health care and medical issues related to endometriosis. Any information presented should not be considered or used as a substitute for, medical advice, diagnosis, or treatment. You should always talk to your health care provider for specific questions regarding personal health or medical conditions.

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