MR enterography shows the small bowel without radiation and is the preferred scan for young patients with Crohn disease. Learn how it works and how to prepare.
MR enterography is an MRI scan of the small bowel done after drinking a special liquid that opens up the loops. It shows inflammation, narrowing (strictures), fistulas and abscesses in Crohn disease, and has the advantage of using no radiation, which matters in young people who need repeated scans. It is often chosen over CT enterography for follow-up.
Why the Small Bowel Needs Special Imaging
Crohn disease can affect any part of the gut but commonly the end of the small bowel. Colonoscopy reaches only the end part, and capsule endoscopy cannot be used if there is a stricture. MR or CT enterography shows the whole length and the wall of the bowel. See CT enterography.
FindingMeaning in Crohn diseaseThickened, enhancing bowel wallActive inflammationNarrowing with dilated bowel before itStricture; may need surgery or dilationTracts between bowel and skin or other organsFistulasFluid collectionsAbscessCreeping fat and enlarged mesenteric nodesChronic disease signsPreparation
- Fast for 4 to 6 hours.
- Drink about 1 to 1.5 litres of a special oral contrast solution over 45 to 60 minutes before the scan.
- An injection to relax the bowel may be given if suitable.
- Tell the staff about kidney disease, allergy, implants and pregnancy.
- You may have loose stool after the drink.
See MRI preparation and MRI abdomen scan.
The Scan
You lie on your back, and the scan takes 30 to 45 minutes, with several breath-holds. Contrast is injected during the scan. Staying still and holding the breath on request give clear pictures. See MRI procedure and MRI with contrast.
Treatment and Monitoring in Crohn Disease
Treatment aims to control inflammation and heal the bowel using steroids, immune medicines and biologic drugs. Regular MR enterography helps see whether the bowel is healing, while blood and stool markers (CRP, calprotectin) track activity. Strictures and fistulas may need surgery. Diet, stopping smoking and mental health support are important. See MRI for perianal fistula if there is anal disease.
MR Enterography vs CT Enterography
MR avoids radiation and is preferred for young patients and repeated scans, but takes longer and needs good breath-holding. CT is faster and widely available and is better for emergencies. Both give similar detail for most Crohn disease questions.
A Practical Example
Kunal, 24, has been treated for Crohn disease for two years. His symptoms improve, but a repeat MR enterography shows a persistent inflamed segment, so his gastroenterologist changes medicine. A scan six months later shows healing. The scan helped him avoid surgery.
Key Facts at a Glance
- MR enterography uses no radiation
- It shows inflammation, strictures, fistulas and abscesses
- Drink the oral contrast as instructed
- A gastroenterologist guides treatment
After the Scan and Next Steps
Take the MRI report to your gastroenterologist. Take medicines regularly, avoid tobacco, attend scheduled colonoscopy and scan appointments, and report blood in stool, weight loss, fever, abdominal pain or fistula discharge. Ask about vaccines and bone health, since long-term treatment can affect them.
Questions to Ask Your Doctor
- How active is my Crohn disease on this scan?
- Do I have a stricture or fistula?
- Do I need surgery or a medicine change?
- How often should I repeat the MR enterography?
Common Mistakes to Avoid
- Not finishing the oral contrast drink.
- Smoking with Crohn disease.
- Stopping medicines when feeling well.
Booking, Timing and Report
Book a slot of about 45 to 60 minutes, and arrive 15 minutes early for the safety form. Carry your doctor's prescription, implant cards and old scans. Reports are usually ready within 24 to 48 hours, and you can request images on a CD or digital link for your specialist.
Frequently Asked Questions
What is MR enterography?
An MRI of the small bowel after a special drink.
Why is it used in Crohn disease?
It shows inflammation and complications without radiation.
Do I need fasting?
Yes, 4 to 6 hours.
How much do I drink?
About 1 to 1.5 litres of contrast.
Is contrast injection needed?
Usually yes.
Is it better than CT?
It avoids radiation and suits repeated scans.
How long does it take?
About 30 to 45 minutes plus drinking time.
Can I have it with a stricture?
Yes.
When is the report ready?
Usually 24 to 48 hours.
Book Your Test at Ganesh Diagnostic
Ganesh Diagnostic & Imaging Centre in Rohini, Delhi offers this test with trained radiology staff and clear reports. You can book an appointment online, check our branches across Delhi NCR, contact us for current rates, or explore all our services. Reports can be downloaded online through our patient portal, so you do not need to make a second trip just to collect them.
This article is for general information only. It does not replace advice from your doctor. Always follow your doctor's instructions for your test.
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