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Evaluation & Diagnosis

Answers begin here.

Our diagnostic process starts with a crucial step, listening deeply to your story. Our aim is to identify the true source of your pain, including causes often missed elsewhere.

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As Thorough as it Gets

Endometriosis & Adenomyosis Evaluation Process

At Lotus Endometriosis Institute, evaluation starts with something simple that is often overlooked: we listen deeply to your story. The goal is not to just check boxes, but to uncover the true root cause of your pain or fertility challenges. This includes potentially diagnosing highly related conditions — which are often missed, ignored, or not even considered by other providers.

We listen, thoroughly

We start by learning about and hearing your full story — every symptom, flare pattern, and past treatment — so nothing important is overlooked. This is why the introductory materials and questionnaires we also send are extremely helpful.  Using the written information in your own words and listening more than one time and usually by more than one provider, gives us the best chance to help you. 

Root Cause Exploration

We conduct careful examination combined with diagnostic insight to distinguish endo from look-alike or coexisting conditions.  Endometriosis can cause a lot of different and sometimes seemingly unrelated symptoms or findings, but it can’t and does not cause everything.  Using clinical expertise, we dig into the details and apply a modern functional approach that produces actionable results.

Oncologic-Level Vigilance

We pay careful attention to rare but serious concerns such as pelvic masses or cancer risk in patients with long-standing or complex disease.  This is combined with evaluation and discussion of any genetic factors than can strongly influence decisions and prognosis.

Targeted Advanced Imaging

Expertly interpreted MRI, ultrasound, or other imaging to identify suspected endometriosis and related pelvic conditions.

Microbiome & Gut Health Testing

When symptoms suggest, we assess for SIBO, leaky gut, and dysbiosis, which can amplify inflammation and pain.

Infection & Environmental Triggers

Selected patients may benefit from evaluation for Lyme disease, mold/mycotoxin exposure, or other chronic infections that worsen immune imbalance.

Immune & Hormonal Screening

We conduct testing for autoimmune overlap, thyroid dysfunction, PCOS, or adrenal imbalance that may complicate symptoms or fertility.

Pelvic Floor & Neurologic Assessment

Identifying pelvic floor dyssynergia, small fiber neuropathy, or central sensitization that contribute to chronic pain.

Vascular & Structural Conditions

Depending upon your symptoms, evaluation may include testing for pelvic venous congestion, May-Thurner Syndrome, and hernias that mimic or worsen endo pain.

Diagnosis

Our evaluation process is designed to be as thorough and comprehensive as possible, not only to look for signs of endometriosis, but to also address related conditions and ensure you receive truly complete care. These steps help us rule out look-alike issues, uncover contributing factors, and guide treatment planning with accuracy. That said, endometriosis cannot be 100% confirmed through imaging, lab work, blood tests, genetic testing, or any other non-surgical method. Because the disease develops within the pelvic cavity and organs, the only way to access the tissue, perform a biopsy, and provide an official diagnosis is through minimally invasive surgery.

Comprehensive Care

Endometriosis rarely exists in isolation, which is why we guide you through a holistic, whole-body evaluation. This includes conditions that mimic, worsen, or coexist with endometriosis — from gut dysbiosis and pelvic floor dysfunction to vascular issues, autoimmune overlap, or even rare but critical cancer risks. Validation through a correct diagnosis is always the first priority. Once we know what’s really happening, treatment can be tailored to your unique condition and goals — whether it be relief of daily pain, improving quality of life, or restoring fertility potential.

My lower abdomen hurts the most. a young female patient talking to a doctor in their office.

Your Care Continues

Pre & Post-operative Evaluation

In some cases, certain biomarkers can help evaluate endometriosis and may be elevated before surgery. Re-testing these markers after surgery to confirm improvement is part of our routine 3-month follow-up appointment (provided free of charge). If endometriomas were found and removed, follow-up ultrasound may also be recommended. For California patients, we can order these studies directly; for out-of-state patients, we provide guidance on what to request locally and review the results with you to ensure nothing is missed.

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After Surgery & Beyond

Post-operative Testing

At Lotus Endometriosis Institute, the surgical intervention does not end when the procedure is complete. We go the extra mile by analyzing the tissues removed, looking for factors that may influence your long-term prognosis and guide tailored recommendations for additional therapies.


This may include:

  • Mitotic index testing – measuring how actively cells are dividing, which provides insight into the biological behavior of your endometriosis.

  • Tissue mast cell density – identifying the level of mast cell activity, which may explain heightened inflammation, pain sensitivity, and symptom severity.

  • Immune and molecular markers – when appropriate, we evaluate immune profiles or emerging biomarkers (such as cfmiR research applications) that can inform ongoing monitoring and future treatment options.

  • Hormone receptor profiling – understanding estrogen and progesterone receptor activity in excised tissue can help personalize decisions about adjuvant hormonal support.

Laboratory assistant putting test tubes into the holder, Close-up view focused on the tubes

Ready When You Are

Ready to start your evaluation?

Most centers stop after surgery. At Lotus, we continue looking for hidden drivers of recurrence or persistent pain, so treatment can be fine-tuned. This “post-op lens” is part of why our care is more complete, and why patients feel more secure after surgery.

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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Can endometriosis cause a painful bump near the anus?

Yes. Endometriosis can contribute to pain and pressure around the rectum and anal area, especially when disease involves the rectum/rectosigmoid region or nearby tissues. Many patients describe deep pain with bowel movements, rectal pressure, or symptoms that flare around their cycle, and those patterns can fit bowel or deep infiltrating endometriosis.


That said, a sensitive bump on the anus itself is more often something else (like a hemorrhoid, fissure, skin infection/abscess, or another localized anal/skin condition). In some cases, pelvic disease can coexist with these issues, which is why we don’t assume every finding is endometriosis—or dismiss it as “nothing.”


If you’re noticing a new, persistent, or worsening bump—especially if it’s very tender, draining, bleeding, or associated with fever—we want to evaluate the full picture. Our team can sort out whether your symptoms point toward bowel endometriosis, a separate anorectal condition, or both, and plan next steps such as a focused exam and, when appropriate, expertly interpreted imaging to map possible deep disease.

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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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When is menstrual bleeding considered too heavy?

Menstrual flow is generally “too heavy” when it consistently disrupts your life or overwhelms your usual period products—think flooding or soaking through pads/tampons quickly, passing frequent or large clots, needing to double up, or bleeding long enough that you can’t plan around it. Another major clue is fatigue, dizziness, or shortness of breath that can come with iron deficiency from ongoing blood loss. If you’re timing your day around bathrooms, waking at night to change products, or avoiding work, exercise, travel, or sex because of bleeding, that’s not something we consider “normal.”


Heavy bleeding is a symptom, not a diagnosis, and common underlying drivers include adenomyosis, fibroids, hormonal imbalance, and sometimes endometriosis—especially when heavy bleeding shows up with severe cramps or deep pelvic pain. Because imaging and symptoms don’t always match (a scan can look “mild” while symptoms are intense), we take a symptom-led approach and look at the full pattern, including pain, pressure, clots, cycle timing, and any signs of anemia. If your bleeding feels like it’s escalating or you’ve been told to “just live with it,” our team can help you sort out likely causes and build a plan that targets the source—not just the bleeding.

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Can endometriosis cause arthritis-like joint pain?

Yes—endometriosis can be associated with arthritis-like joint pain in some people, even though joint pain isn’t considered a classic “core” symptom. Endometriosis can drive chronic inflammation and immune dysregulation, and that whole-body inflammatory state may show up as aching, stiffness, or flares that feel similar to inflammatory arthritis. Some patients also notice joint symptoms that cycle with their period or worsen during broader endometriosis flares.


At the same time, endometriosis doesn’t “equal” autoimmune arthritis, and an association doesn’t prove that one causes the other. Research suggests higher rates of certain autoimmune conditions in people with endometriosis—including inflammatory diseases that can affect joints—so persistent joint pain deserves a full-picture evaluation rather than being automatically attributed to pelvic disease alone. If you’re dealing with pelvic pain plus joint symptoms, our team can help you sort out what fits endometriosis, what may be a related immune condition, and how that affects your treatment plan, including whether excision surgery and coordinated integrative support make sense for you.

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How does estrogen affect the endometrium?

Estrogen is one of the main hormones that drives endometrial growth. In the first half of the menstrual cycle, rising estrogen signals the endometrium to thicken and rebuild after a period, preparing the uterus for a possible pregnancy. It also influences the local immune and inflammatory environment in the uterus, which is part of why hormonal shifts can change bleeding patterns and pain.


When estrogen’s growth signals are strong—and progesterone’s “calming” effect is weaker than expected (often described as progesterone resistance)—the endometrium can behave in a more persistently inflamed, reactive way. This hormone–inflammation pattern is especially relevant in estrogen-dependent conditions like adenomyosis and endometriosis, where tissue similar to the endometrium can contribute to ongoing symptoms. If you’re trying to make sense of heavy bleeding, severe cramping, or cycle-linked pelvic pain, our team can help you connect the hormonal biology to what you’re feeling and review next steps for diagnosis and treatment.

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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