Endometriosis Ultrasound: Finding Clues to Your Pain

By Dr. Priya Sammani ( MBBS, DFM )

It’s a story I hear so often in my clinic. Someone comes in, month after month, with period pain that’s just… a lot. More than just cramps. Pain that makes them miss work, or school, or just life. And one of the first things we might talk about, especially if we suspect endometriosis, is an endometriosis ultrasound. It’s a way for us to get a peek inside and see what might be going on.

Now, what exactly is this endometriosis we’re talking about? Imagine the tissue that normally lines your uterus – we call it the endometrium. In endometriosis, bits of tissue similar to that lining start growing in places they shouldn’t. Think ovaries, bladder, even your intestines. This out-of-place tissue can get inflamed, form cysts, and, well, cause that really tough pain.

So, What’s an Endometriosis Ultrasound All About?

An endometriosis ultrasound is an imaging test. It uses sound waves – completely safe, no radiation – to create pictures of your pelvic organs. Most of the time, for this specific look, it’s a transvaginal ultrasound. That means a slim, lubricated probe, about the size of a finger, is gently placed inside your vagina. It sounds a bit intimidating, I know, but it gives us the clearest view.

This scan helps us look for clues. Can it give us a definite “yes, you have endometriosis”? Not always, and that’s a really important point. It’s more like a detective gathering evidence.

What Can We Actually See (and Not See)?

Here’s the thing: an endometriosis ultrasound is pretty good at spotting some things, but not others.

  • What it often shows:
  • Endometriomas: These are cysts, often on the ovaries, that are filled with old blood from endometrial tissue. Sometimes they’re called “chocolate cysts” because of their dark appearance. If these are there, an ultrasound is usually good at finding them.
  • Deeply Infiltrating Endometriosis (DIE): This is when the endometrial-like tissue has grown deeper, maybe 5 millimeters or more, into organs like your bowel or bladder.
  • Larger clumps of tissue or significant scarring.
  • What it usually misses:
  • Superficial endometriosis: These are tiny, flat patches of tissue, often less than 5mm. They’re actually the most common type of endometriosis, but they’re just too small for the ultrasound to pick up.

So, you see, even if the ultrasound looks normal, it doesn’t completely rule out endometriosis. It’s a bit like looking for something in a dimly lit room; you can see the big furniture, but the smaller items might be hidden.

Why Would I Suggest This Scan?

If you’re dealing with symptoms that make us think of endometriosis – like really painful periods, pain during sex, or even trouble getting pregnant – I might suggest an endometriosis ultrasound. Here’s why:

  • Getting closer to an answer: It helps us gather information. It can also help rule out other things that might be causing your symptoms.
  • Checking on known issues: If we already suspect or know about endometriomas or DIE, an ultrasound can help us see if they’re changing or how they’re responding to any treatments we’ve started.
  • Planning for surgery, if needed: The gold standard for diagnosing endometriosis for sure is a laparoscopy. That’s a minimally invasive surgery where a tiny camera is used to look directly inside. If we’re considering this, an ultrasound can be like a roadmap, showing the surgeon where to look and what to expect. Sometimes, if tissue is near sensitive spots like your bladder, it helps us make sure the right specialists are on hand for the surgery.

Preparing for Your Endometriosis Ultrasound

There isn’t usually a lot of complicated prep. I’ll give you specific instructions, of course. Sometimes we need your bladder to be full, other times empty. The main thing is to follow the checklist we give you. Don’t hesitate to ask questions beforehand!

What Happens During the Scan?

Alright, so you’re in the room.

  1. An ultrasound technician, often called a sonographer, will explain everything.
  2. For a transvaginal ultrasound, you’ll undress from the waist down (we’ll give you a sheet for privacy) and lie on an examination table, usually with your feet in stirrups, similar to a Pap smear.
  3. The technician will gently insert the lubricated ultrasound wand (probe) into your vagina.
  4. They’ll move the wand a bit to get images from different angles. You might feel some pressure, and if you have endometriosis, it can sometimes be uncomfortable or even a bit painful. Please, please let the technician know if it’s too much. We can adjust things.
  5. The images pop up on a screen.

The whole thing usually takes about 30 minutes to an hour. It’s a safe procedure, really. The sound waves are harmless.

Understanding Your Ultrasound Results

After the scan, a radiologist (a doctor who specializes in reading medical images) will look at the pictures and write a report. I’ll then get that report, usually within a few days, and we’ll discuss it.

  • A “normal” result: This means the ultrasound didn’t show any large cysts or deep endometriosis. But remember, it doesn’t mean you don’t have endometriosis, especially the superficial kind.
  • Signs of endometriosis: The report might describe findings like endometriomas on your ovaries, or signs of tissue in your bowel or bladder.

Based on these results, we’ll talk about what’s next. Maybe it’s trying some treatments to help with your symptoms, even without a surgical diagnosis. Or, we might discuss if an MRI (another type of scan) or a laparoscopy is the right next step for you to get a more definitive answer.

Take-Home Message: What to Remember About Endometriosis Ultrasound

This can all feel like a lot, I know. So, let’s boil it down:

  • An endometriosis ultrasound is a helpful first step if we suspect endometriosis, especially the transvaginal kind.
  • It’s good at finding larger issues like endometriomas (ovarian cysts) or deeply embedded tissue.
  • It often misses smaller, superficial endometriosis, so a normal scan doesn’t rule it out.
  • The only way to be 100% sure about an endometriosis diagnosis is through a laparoscopy (surgery).
  • The ultrasound helps us plan, decide on next steps, and can guide treatment for your symptoms, even if we don’t have that surgical confirmation yet. We want to help you feel better.

You’re not alone in this. So many people navigate these symptoms and diagnostic journeys. We’ll figure out the path forward together, one step at a time.

Dr. Priya Sammani
Medically Reviewed by
MBBS, Postgraduate Diploma in Family Medicine
Dr. Priya Sammani is the founder of Priya.Health and Nirogi Lanka. She is dedicated to preventive medicine, chronic disease management, and making reliable health information accessible for everyone.
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