Understanding deeply infiltrative endometriosis

By adm1ak7xe 07/08/2026 4 min read 38 views

Deeply infiltrative endometriosis is a rare and severe form of endometriosis. The condition occurs when uterine lining-like tissue grows in other parts of the body, specifically organs near or inside the pelvic cavity. This advanced form spreads to areas outside the pelvis, affecting the bladder, intestines, and reproductive system.

Doctors classify endometriosis by type and stage based on its location, depth, and the amount of tissue affected. The four main types include superficial peritoneal endometriosis, endometrioma, deeply infiltrative endometriosis, and abdominal wall endometriosis. Stages range from minimal to severe.

Stage 1 or minimal involves minimal implants with little or no scar tissue. Stage 2 or mild sees implants deeper in the tissue along with some scar tissue. Stage 3 or moderate features various deep implants, potential ovarian cysts, and thick areas of scar tissue called adhesions. Stage 4 or severe indicates widespread implants that may be deep with dense adhesions and large cysts on one or both ovaries.

Deeply infiltrative endometriosis is rare, affecting roughly 1% of women of reproductive age. This aggressive form causes endometrial-like tissues to invade organs inside the pelvis, abdomen, and other areas. Lesions associated with this condition often affect regions rich in nerve fibers, causing severe irritation and pain.

People living with endometriosis often experience severe and frequent cramps and pain during menstruation, known as dysmenorrhea. They may also experience pain with sexual intercourse and generalized pelvic pain. This pain may be chronic or only happen at certain times during the menstrual cycle.

Deeply infiltrative endometriosis may also affect a person’s fertility due to the way the condition alters the anatomy of the pelvis and causes scar tissue to develop. Adhesions can prevent eggs from traveling or implanting in the uterus. They may also cut off blood supply to the ovaries or trap blood in the ovaries, causing cysts.

When the condition affects the bladder or urinary tract, a person might feel pain when the bladder is full, often feel the need to urinate urgently, or experience burning sensations. Bladder endometriosis can also cause pelvic and lower back pain.

Endometrial-like tissue can grow anywhere in the bowel, but research from 2014 suggests around 9 in 10 bowel endometriosis cases affect the rectum or sigmoid colon. Symptoms include general pelvic pain, pain during sexual intercourse, painful bowel movements, constipation, and diarrhea. These symptoms often vary between individuals and with the menstrual cycle.

Doctors may find it challenging to diagnose endometriosis, as there is no singular test to confirm the condition. Symptoms may also resemble those of other health problems. A laparoscopy is often the best way to diagnose endometriosis, but this presents significant challenges. Doctors may use a combination of a pelvic exam, an ultrasound scan, an MRI scan, and a biopsy.

Endometriosis has no cure, but there are several treatment options that may provide relief from painful symptoms. Treatment may aim to relieve pain, improve fertility, slow the growth of endometriosis tissue, or prevent it from returning.

With conservative surgery, the surgeon aims to remove only affected tissue and leaves healthy tissue intact. Laparoscopic excision is the gold standard of endometriosis treatment. During this procedure, the surgeon attempts to remove or cut the entire lesion from wherever it is in the body with minimal use of heat and electricity. Surgeons often use laser ablation to destroy endometriosis lesions, but there is a risk of damaging surrounding healthy tissue. In most cases, ablation is not effective long term. Laparoscopic excision is the best option.

If endometriosis affects a specific site, a surgeon may choose definitive surgery to remove the affected organ. For example, the surgeon may remove the uterus during a hysterectomy. They may also remove the ovaries and cervix. However, it is key to understand that a hysterectomy does not cure endometriosis, as the implants have often developed in other areas.

A person may use anti-inflammatory medication such as paracetamol or ibuprofen to ease the pain. However, if these over-the-counter options bring no relief, they may wish to talk with a doctor about prescription options.

A doctor may recommend hormone treatment to limit estrogen production in the body, as this hormone encourages endometriosis tissue to develop. Hormone treatment options include the combined oral contraceptive pill, progesterone-only options such as the minipill, Depo-Provera, the progesterone intrauterine system, and the contraceptive implant. More powerful hormonal treatments such as leuprolide acetate (Lupron) injections are also an option.

People with deeply infiltrative endometriosis may experience complications, including adhesions and frozen pelvis. Adhesions are fibrous bands of scar tissue that may form in response to injuries and surgery or as the body reacts to the inflammation from endometriosis implants.

If someone has a frozen pelvis, it means that the organs of the pelvis become tethered to each other by adhesions and “frozen” in position. It is incredibly challenging to operate on a frozen pelvis because the anatomy is distorted, leading to an increase in complications.

Studies suggest that 30–50% of people with endometriosis experience infertility. However, experts have not yet confirmed the exact relationship between the two. Another point worth noting is that if a person with deeply infiltrative endometriosis becomes pregnant, they have double the risk of undergoing a cesarean section compared with people who do not have endometriosis.