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Endometriosis and adenomyosis are chronic, complex conditions involving abnormal tissue growth within the pelvic cavity (and sometimes beyond in the case of endometriosis).
While they share some similarities, they are distinct conditions with unique challenges.
This guide overviews the key differences and similarities between endometriosis and adenomyosis and how these conditions can impact fertility.
Endometriosis is a condition in which endometrial-like tissue grows outside the uterus. Its cause is unknown, and there’s currently no cure for the disease.
Endometriosis isn’t just a “menstruation disease;” it’s a whole-body disorder that can affect a person’s entire life, from physical health to emotional well-being.
The American Society for Reproductive Medicine (ASRM) classifies endometriosis into four stages based on the number of lesions present, their size, and the extent of involvement.
These stages range from Stage I (minimal) to Stage IV (severe).
It’s important to note that the stage classification of endometriosis does not necessarily correlate with the severity of symptoms or the impact on an individual’s quality of life.
The Endometriosis Foundation of America (EndoFound) developed a classification system to help patients better understand the ASRM staging system.
The EndoFound classification system categorizes endometriosis into four categories:
Category I: Peritoneal Endometriosis
Peritoneal endometriosis refers to the presence of endometriosis lesions on the peritoneum, which is the lining of the abdominal cavity.
Category II: Ovarian Endometriomas (Chocolate Cysts)
Ovarian endometriomas, or chocolate cysts, are cystic structures filled with dark brown endometrial fluid that develop on the ovaries. These cysts can vary in size, cause pain and discomfort, and affect the ovarian function.
If the cyst ruptures, it can spread endometriosis to surrounding areas.
Category III: Deep Infiltrating Endometriosis I (DIE I)
Deep infiltrating endometriosis I refers to deep lesions that penetrate the surrounding tissues, such as ovaries, rectum, or other pelvic structures.
Category IV: Deep Infiltrating Endometriosis II (DIE II)
When endometriosis grows on organs inside and outside the pelvic cavity, it’s classified as deep infiltrating endometriosis II. These areas may include the bowels, appendix, diaphragm, heart, lungs, and, in severe cases, the brain.
There’s no definitive way to diagnose endometriosis without undergoing a diagnostic laparoscopy, a surgical procedure in which a fiber-optic instrument (laparoscope) is inserted through the abdominal wall to view the stomach or pelvic area.
However, a few telltale signs and symptoms may indicate the possibility of endometriosis.
These include:
People with the following risk factors may be more likely to develop endometriosis:
There’s no cure for endometriosis; however, there are ways to manage and treat the symptoms associated with the condition, including:
Pain Management
Hormonal Therapy
Surgery
Adenomyosis is when endometrial tissue grows into the myometrium or the muscle wall of the uterus. Often referred to as the “evil twin sister” of endometriosis, adenomyosis shares some similarities with endometriosis but has its own unique characteristics.
Adenomyosis typically occurs in women who are in their 30s and 40s and have had children. However, it can also occur in younger women or those without children.
There are three main types of adenomyosis:
Focal Adenomyosis
Focal adenomyosis refers to when adenomyosis is limited to one specific area or region of the uterus.
Adenomyoma
Adenomyoma is characterized by the formation of a localized mass or tumor within the uterine muscle.
Diffuse Adenomyosis
Diffuse adenomyosis occurs when it affects the entire uterus or large areas, causing widespread tissue infiltration throughout the myometrium.
The only definitive way to diagnose adenomyosis is through a surgical procedure, such as a hysterectomy or laparoscopic deep excisional adenomyosis surgery (LEAS).
Magnetic resonance imaging (MRI) and transvaginal ultrasonography may be able to provide a non-invasive assessment, but a confirmed diagnosis can only be made through surgery.
Although one in three people with adenomyosis are asymptomatic (do not have symptoms), some common signs and symptoms of adenomyosis include:
People with the following risk factors may be more likely to develop adenomyosis:
There’s no one-size-fits-all solution for managing and treating adenomyosis, but potential options include:
Medical Management
Surgical Management
The main difference between endometriosis and adenomyosis is that endometriosis occurs outside the uterus, whereas adenomyosis involves endometrial tissue growing within the muscular wall of the uterus itself.
This misplaced tissue responds to hormonal changes just like the normal lining, but because it’s embedded deeper, it can’t be shed during menstruation, leading to persistent pain, heavy bleeding, and other symptoms associated with adenomyosis.
The location of the misplaced tissue influences the type of pain experienced.
Endometriosis often causes pelvic pain that can be severe and radiates to other areas like the lower back, thighs, and even the rectum. Pain may worsen during menstruation, ovulation, or bowel movements.
Adenomyosis primarily affects the uterus, leading to symptoms like painful periods, heavy bleeding, and sometimes cramping that can occur throughout the menstrual cycle, not just during periods.
It’s important to note that while endometriosis and adenomyosis are distinct conditions, they often occur together. Studies show a significantly higher prevalence of adenomyosis in women with endometriosis, ranging from 15% to nearly 90%, depending on the diagnostic method.
Both endometriosis and adenomyosis can cause infertility or difficulty getting pregnant.
Infertility is the sixth fundamental symptom of endometriosis.
Here are a few ways endometriosis can affect fertility:
These issues can make it harder to get pregnant and may increase the risk of miscarriage.
According to one 2021 review published in the International Journal of Environmental Research and Public Health, adenomyosis may increase the risk of miscarriage, premature birth, and early rupture of membranes during pregnancy.
Here are a few ways adenomyosis can affect fertility:
If you suspect you have endometriosis or adenomyosis, early diagnosis and treatment are essential to improving fertility outcomes. A healthcare professional experienced in women’s health can create a personalized treatment plan to address your needs and improve your quality of life.
In 2018, RMA published award-winning research on the link between adenomyosis seen on 3D ultrasound and clinical outcomes following IVF.
Our research showed that only women with obvious adenomyosis on 3D ultrasound are at increased risk for adverse outcomes following frozen embryo transfer. Specifically, the study demonstrates that women with obvious adenomyosis have a higher likelihood of experiencing miscarriage.
Most prior studies regarding adenomyosis focused on outcomes following fresh embryo transfer. With an increasing trend toward frozen embryo transfer, we felt examining outcomes in this patient population was important.
The study began by evaluating outcomes in patients with adenomyosis compared to those without; no difference was found in clinical outcomes. However, when looking at the 21 patients with obvious adenomyosis, some differences emerged. Specifically, patients with obvious adenomyosis were almost four times as likely to experience a miscarriage compared to those without adenomyosis – those with the condition had a 23.8 percent chance of miscarrying, while those without it had a 6.3 percent chance.
What was probably most interesting, however, is that we did not see a difference in clinical outcomes for patients with more subtle adenomyosis. This suggests that only patients with obvious adenomyosis are at increased risk for adverse outcomes following frozen embryo transfer.
Endometriosis and adenomyosis can present challenges on the path to parenthood. RMA Network is a leading provider of advanced reproductive technologies (ART) with a network of clinics nationwide. Our fertility specialists understand the complexities of these conditions and can help you explore all your options, including IUI, IVF, and other assisted reproductive techniques, to achieve your dream of becoming a parent.
Remember: With knowledge and the right support system, you can manage endometriosis or adenomyosis and take control of your reproductive health.