MRI can be useful when endometriosis is suspected, especially where deep, complex or organ-involving disease needs to be assessed.

However, MRI does not show every type of endometriosis in every person. A normal MRI does not always rule out endometriosis.

What is MRI?

MRI stands for magnetic resonance imaging. It uses magnets and radio waves to create detailed images of the body.

For endometriosis, MRI may be used to look more closely at pelvic organs and surrounding tissues. It may be especially helpful when deep disease is suspected or when surgery is being planned.

What MRI may help show

MRI may help assess:

  • deep endometriosis
  • endometriomas
  • bowel involvement
  • bladder involvement
  • ureter involvement
  • adenomyosis
  • adhesions or distortion of pelvic anatomy
  • the extent of disease before surgery
  • other possible causes of symptoms

MRI can be useful for mapping disease so the right specialists can be involved if surgery is being considered.

When MRI may be suggested

MRI may be considered if:

  • deep endometriosis is suspected
  • bowel, bladder or ureter involvement is possible
  • ultrasound findings need more detail
  • surgery is being planned
  • symptoms suggest complex disease
  • specialist imaging is needed to guide referral

Not everyone with suspected endometriosis needs MRI. The decision should depend on symptoms, examination findings, ultrasound results, clinical judgement and what the scan is expected to add.

Specialist reporting matters

MRI for endometriosis should ideally be planned and interpreted by professionals with specialist expertise in gynaecological imaging and endometriosis.

This matters because endometriosis can be subtle, and the scan needs to be read with the right question in mind.

You can ask:

  • Will this MRI be reported by someone with endometriosis imaging experience?
  • Will the scan look for deep endometriosis?
  • Will bowel, bladder and ureter involvement be assessed?
  • Will adenomyosis be considered?

What MRI may miss

MRI may not show:

  • superficial endometriosis
  • small lesions
  • subtle disease
  • some adhesions
  • some extra-pelvic disease
  • disease outside the area scanned

This is why MRI should be interpreted alongside symptoms, history, examination and other findings.

Does a normal MRI rule out endometriosis?

No.

A normal MRI does not always rule out endometriosis. It may mean that no disease was visible on that scan.

If symptoms continue to affect your life, ask what the next step should be.

Preparing for an MRI discussion

You may want to ask:

  • Why is MRI being recommended?
  • What areas will it assess?
  • Is bowel, bladder, ureter or deep disease suspected?
  • Will the scan be read by a specialist?
  • What happens if the MRI is normal?
  • What happens if the MRI shows deep endometriosis?
  • Would I need a specialist endometriosis service?

Use the Prepare for Appointment Tool

Use our Prepare for Appointment Tool before appointments about imaging. It will help you organise symptoms, previous scan results, questions and concerns.

Final reminder

MRI can be a useful tool, especially for deep or complex disease, but it is not a complete rule-out test.

Your symptoms still matter, even if MRI does not show endometriosis.