Ultrasound for endometriosis: What a Scan Can and Cannot Show

Ultrasound can provide useful information in an endometriosis assessment, but it cannot answer every question. A scan may identify an ovarian endometrioma, some forms of deep endometriosis, or a different condition that could explain symptoms. A normal scan does not rule out endometriosis.

Ask what the scan is looking for

The request should connect with your symptoms. Tell the referring clinician about bowel pain, urinary symptoms, pain during sex, and any previous surgery or scans. These details can affect which examination is most useful.

Some superficial endometriosis is not visible on routine imaging. This is one reason a clear scan should not end the conversation when symptoms continue to affect your life. The diagnosis guide explains the wider pathway.

Understand the approach being offered

A transvaginal scan uses a probe placed in the vagina to obtain images of the pelvis. It is commonly offered for suspected endometriosis. If it is unsuitable or you do not want it, an abdominal scan may be considered instead.

Ask about preparation, consent, a chaperone, and what to do if the scan is uncomfortable. Tell the team about pain or concerns before it starts. You can ask for the examination to stop.

Different approaches have different limits. Declining an internal scan should lead to a discussion of alternatives and what they can establish, not an assumption that no assessment is possible.

Specialist imaging can answer a different question

When deep endometriosis is suspected, specialist ultrasound or pelvic MRI may help map its extent. Planning and interpretation by someone with relevant expertise matter, especially when the bowel, bladder, or ureters may be involved.

An MRI is not automatically the next test for everyone, and it also cannot exclude all endometriosis. Ask how the proposed result would change treatment or referral.

Make sure the result leads to a plan

Find out who will explain the report and whether a specialist referral has already been arranged. Bring previous reports where possible so the clinician can compare findings in context.

If symptoms persist despite normal imaging, further assessment, treatment, or laparoscopy may still be discussed. That decision should consider your symptoms, treatment experience, preferences, and the risks of the procedure.

Avoid interpreting one phrase in a report as the whole diagnosis. Ask what was seen, what was not assessed reliably, and what the next step is for the symptoms that brought you to care.