Diagnosis
What is an endometriosis ultrasound mapping exam?
The short answer
An endometriosis ultrasound mapping exam is a specialized pelvic ultrasound to identify where endometriosis is suspected. In experienced hands, it looks for signs of deep disease and possible bowel involvement to help plan surgery, but imaging can miss disease.
An endometriosis ultrasound mapping exam is a specialized pelvic ultrasound performed to map where endometriosis is suspected, rather than simply check whether a cyst or mass is present. In experienced hands, it looks for signs of deep endometriosis and evaluates key areas such as the ovaries, uterosacral ligaments, and the pouch of Douglas. It also checks for findings that suggest bowel involvement or reduced organ mobility from adhesions.
Mapping matters because a yes-or-no answer about endometriosis leaves out details needed for surgical planning: its location, size, and how deeply it may involve surrounding structures. In some situations, especially when rectal endometriosis is suspected, your evaluation may include more than one ultrasound approach, such as transvaginal ultrasound and, when needed, an endorectal ultrasound to better assess the rectal wall layers.
We use imaging as one piece of a comprehensive evaluation that starts with your full symptom story and a careful exam, because imaging can miss disease or fail to fully describe what’s driving your pain. If you’re considering surgery or have complex symptoms, our team can help you understand what a mapping exam can (and can’t) tell us and what information we still need to plan the safest, most effective next step.
Where to go from here
Understand it, compare it with what you're feeling, then talk it through with us.
Step 1 · Understand
Understand the condition
Step 2 · Compare
Symptoms it can relate to
Step 3 · Speak with Us
Understand Your Endometriosis Map
Our specialists use advanced ultrasound mapping to pinpoint the exact location and extent of your endometriosis. This detailed insight guides precise treatment tailored to your needs.
Questions people ask next
All diagnosis questionsStandard pelvic ultrasound vs endometriosis-focused scan: what’s different?
A standard pelvic ultrasound surveys the uterus and ovaries, while an endometriosis-focused scan uses targeted imaging and checks how pelvic organs move against each other. A standard scan may miss deep disease or scarring; a focused scan can help with surgical planning.
Do I need bowel prep for an endometriosis ultrasound?
Usually, no bowel prep is needed for a standard transvaginal ultrasound to evaluate suspected endometriosis. Bowel prep is more commonly discussed for specialized imaging of suspected bowel involvement or when the imaging team has a specific protocol.
Will endometriosis show up on ultrasound?
Sometimes, but a normal ultrasound does not rule out endometriosis. Ultrasound is best at detecting endometriosis cysts in the ovaries and, in skilled hands, signs of deep disease or scarring; many superficial lesions are too small or subtle to be seen on standard imaging.
How is deep infiltrating endometriosis diagnosed without surgery?
Deep infiltrating endometriosis is evaluated without surgery using specialized imaging, mainly an expert-performed transvaginal ultrasound. Pelvic MRI can add detail about the depth and extent of suspected lesions and their relationship to nearby organs.
Further reading
Do You Need Two Ultrasounds Before Bowel Endometriosis Surgery?
How TVS (transvaginal) and ERUS (endorectal) map rectal endometriosis, guide bowel surgery planning, flag stenosis and risks, and who benefits.
Can Scans and Tests Find Endometriosis? Know the Limits
Discover why ultrasounds may miss endometriosis. Learn about imaging limits and recent research in our latest blog. Find clarity in your diagnosis.
Deep Infiltrating Endometriosis: Current and Future Treatments
Deep infiltrating endometriosis: symptoms, causes, diagnosis and treatment. Medical therapy, ICG-guided surgery, stenting, pathology, and future outlook.
