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Explore how endometriosis is detected and distinguished: differential diagnosis, biomarkers, ultrasound, and MRI—what each test shows, when it’s used, and how results guide accurate, timely care.

Overview

Reliable evaluation of endometriosis depends on understanding what each diagnostic tool reveals about the pelvis. Expert Ultrasound and MRI are the most valuable imaging methods, each offering unique strengths. Ultrasound is excellent for identifying endometriomas and certain deep lesions, while MRI provides a comprehensive map of structures affected by disease and is especially useful for planning treatment, including Excision Surgery when that is indicated.


Imaging also plays a critical role when symptoms resemble overlapping conditions such as IBS / IBD or Interstitial Cystitis. Differentiating these possibilities helps target the right therapeutic approach and prevents delays in care.


Even with advanced technology, many lesions—especially superficial or microscopic ones—remain invisible. A normal scan does not rule out endometriosis, nor does an abnormal scan determine the full extent of disease. Understanding what imaging can and cannot show leads to better expectations and more informed decisions about next steps in treatment and symptom management.

Common Questions

How rare is endosalpingiosis?

Endosalpingiosis is generally considered uncommon, but “how rare” it is depends heavily on who’s being studied and how it’s found. Many cases are discovered incidentally on pathology—meaning tissue is identified under the microscope after surgery done for other reasons—so it’s likely underrecognized in the general population. In other settings (like surgical cohorts), it may appear more often simply because more tissue is being sampled and examined carefully.


What matters most for patients is that endosalpingiosis can be confused with endometriosis on imaging or even at surgery, yet it doesn’t always behave the same way clinically. If you’ve been told you have endosalpingiosis and you also have pelvic pain, bowel/bladder symptoms, or fertility concerns, our team can help interpret what that finding means in the context of your symptoms and operative/pathology reports. You’re welcome to explore our educational content on related endometriosis and uterine conditions, and reach out to schedule a consultation if you want a personalized plan.

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What is the AAGL endometriosis classification system?

The AAGL endometriosis classification system is a standardized way surgeons describe what they found at surgery—where endometriosis is located, how extensive it is, and how complex the disease appears. Its goal is to create a more consistent “shared language” than older staging alone, especially for cases where symptoms and imaging don’t tell the full story.


Unlike simple stage labels, AAGL-style classification is meant to better capture real-world surgical complexity, including deeper disease that can involve structures like the uterosacral ligaments, rectovaginal space, bowel, bladder, or ureters. This matters because location and depth (for example, deep infiltrating disease) can drive very different symptoms and may change imaging choices and surgical planning. If you’re reading an operative report or trying to make sense of what a surgeon told you, our team can help translate the classification into what it likely means for your body, your symptoms, and the treatment path you’re considering.

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Can endometriosis spread to the brain?

Yes—endometriosis can occur outside the pelvis, and it has been reported in distant parts of the body. That said, brain involvement is extremely rare compared with pelvic disease or even other extra‑pelvic locations like the diaphragm and chest.


When people worry about “endo in the brain,” it’s often because they’re experiencing neurologic symptoms (headaches, nerve-type pain, numbness/weakness) that seem to flare with their cycle. Sometimes those symptoms are related to endometriosis affecting nerves or areas higher in the abdomen/chest rather than the brain itself, and the cyclical timing can be an important clue. If you have unusual symptoms that track with menstruation, our team can help you think through the full-body picture, determine what’s most likely, and map out next steps for accurate diagnosis and treatment—including minimally invasive excision when appropriate.

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What is the Enzian score for endometriosis?

The Enzian score is a detailed way clinicians describe where deep infiltrating endometriosis (DIE) is located and how extensive it is. Unlike simple “stage” systems, Enzian focuses on endometriosis that grows into deeper tissues and can involve structures like the uterosacral ligaments, rectovaginal area, bowel, bladder, and ureters—areas that often drive bowel, urinary, or deep pain symptoms.


In practical terms, an Enzian classification helps your surgical team communicate the anatomic pattern of disease and plan the right imaging, operative approach, and multidisciplinary support when organs may be involved. It’s also a reminder that symptom severity doesn’t always match what’s seen on exam or imaging—deep disease can be easy to miss without a targeted evaluation. If you’ve been told your findings are “mild” but your symptoms suggest deeper involvement, our team can help interpret prior reports and discuss what an Enzian-style mapping and excision-focused plan could look like.

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How fast does endometriosis grow?

Endometriosis doesn’t grow at one predictable “rate.” It’s a heterogeneous condition—meaning different subtypes and lesion types can behave very differently—so one person may have slow, relatively stable disease while another has more biologically aggressive, invasive lesions that progress faster. Growth is influenced by where it is (surface vs deeper tissues or organs), the local inflammatory environment, and hormone signaling (including local estrogen activity and reduced progesterone response).


What most people notice first isn’t literal growth you can feel happening day-to-day, but changing symptoms over months or years—new bowel or bladder symptoms, worsening pain, or the appearance/enlargement of an endometrioma on imaging. It’s also why “stage” doesn’t reliably predict pain, and why a normal exam (or even normal imaging) doesn’t rule out active disease, especially with deep infiltrating endometriosis. If you’re trying to understand whether your symptoms suggest progression, our team can help you connect your symptom pattern with the most likely disease types and next diagnostic steps, and discuss when strategic excision surgery is appropriate.

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Can a ruptured ovarian cyst cause severe pelvic pain?

Yes. A ruptured ovarian cyst can cause sudden, severe pelvic pain—often sharp and one-sided—and it may be intense enough to feel alarming, especially if there’s internal bleeding or irritation of the lining of the pelvis. Some people also notice nausea, shoulder-tip pain, dizziness, or pain that worsens with movement, while others have a milder ache that fades over hours to days.


Because pelvic pain has many look-alikes and coexisting causes (including endometriosis, adenomyosis, ovarian/paraovarian cysts, torsion, bladder pain, or pelvic floor spasm), what matters is the pattern of your symptoms, your exam, and correctly interpreted imaging like ultrasound or MRI when appropriate. Our team focuses on sorting out whether a cyst rupture is the whole story—or one piece of a bigger picture—so you’re not stuck treating the wrong problem. If you’re having severe pain, recurrent “cyst” episodes, or pain that tracks with your cycle, reach out to schedule an evaluation so we can pinpoint the driver and map out next steps.

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Is a retroverted uterus linked to endometriosis?

A retroverted uterus (a uterus that tilts backward) is usually a normal anatomical variation, and by itself it doesn’t diagnose endometriosis. That said, endometriosis can be associated with a “fixed” or less-mobile retroverted uterus when inflammation, adhesions, or deep disease tether the uterus backward and limit how it moves on exam.


If your imaging report mentions a retroverted uterus and you also have symptoms like painful periods, deep pain with sex, bowel/bladder pain (often cyclical), or chronic pelvic pain, we look at the whole picture—not just the uterine position—to assess whether endometriosis and/or adenomyosis could be contributing. Our team can help interpret your ultrasound/MRI findings in context and, when appropriate, discuss whether minimally invasive excision surgery is the best next step for both diagnosis and lasting relief.

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Can a retroverted uterus cause pelvic pain or cramps?

A retroverted uterus (a uterus that tilts backward) is a common anatomic variation, and by itself it often doesn’t cause symptoms. Some people do notice more cramping, pelvic pressure, or deep pain with sex—especially in certain positions—but when significant pain is present, we look beyond uterine “tilt” alone.


In our experience, a retroverted uterus is frequently a clue to check for other pain drivers that can coexist, such as endometriosis (which can tether the uterus backward), adenomyosis (which can cause strong, painful uterine contractions), pelvic floor muscle overactivity, or bladder/bowel contributors. If your cramps are severe, worsening over time, occurring outside your period, or paired with deep dyspareunia, bowel/bladder symptoms, heavy bleeding, or infertility, it’s worth a full evaluation rather than stopping at “your uterus is retroverted.” If you’d like, our team can help sort out what’s actually generating your symptoms and outline options—from targeted imaging and diagnostics to definitive surgical treatment when appropriate.

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Reach Out

Have a question?

Dr. Steven Vasilev delivers best-in-class endometriosis guidance and a personalized treatment plan—built on evidence and your unique biology.


Led by Steven Vasilev, MD—an internationally recognized endometriosis specialist & MIGS surgeon—Lotus Endometriosis Institute is virtual-forward, with many patients traveling nationally for care. Clinical evaluation and surgical treatment are provided in California.

Santa Monica, CA

2121 Santa Monica Blvd, Santa Monica, CA 90404

Operating Hours

8:00 am - 5:00 pm
Monday - Friday

Arroyo Grande, CA

154 Traffic Way, Arroyo Grande, CA 93420