MR enterography

MR enterography is a new non-invasive technique for diagnosis of small bowel disorders.

The most common indication is to evaluate patients with Crohn disease (CD).

Actual procedure will vary depending on institutional protocol/guidelines but below is a typical description 1, 2:

  • patients should abstain from all food and drinks for 4-6 h prior to the study
  • patients drink about 1-1.5 L of a 2.5% mannitol solution at regular intervals over a period of approximately 40 minutes prior to the study
    • this solution acts as a hyperosmolar agent which draw fluid into the bowel and (biphasic) appears as low signal intensity on T1-weighted images and high signal intensity on T2-weighted images
  • scanning is ideally performed on a 1.5T MRI scanner, using a phased array surface coil, either in the supine or prone position
  • comprehensive MR examination of the small bowel usually requires axial and coronal both T1 and T2 weighted images
  • high-resolution ultra-fast sequences such as true fast imaging with steady-state precession (true FISP) and HASTE sequences with and without fat suppression are usually used
  • fat-suppressed three-dimensional (3D) T1-weighted breath-hold gradient-echo images of the abdomen and pelvis before and after intravenous gadolinium-based contrast material administration
  • no ionising radiation
  • high contrast resolution and multiplanar capability
  • it can detect mural small bowel disorders with possible extramural complications and also allows the detection of the extra-intestinal solid organ pathologies
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Article Information

rID: 30690
Sections: Approach, Physics
Synonyms or Alternate Spellings:
  • MRI Enterography
  • Magnetic resonance enterography
  • MR enterography (MRE)

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Cases and Figures

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    Case 1: normal MR enterography
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    Case 2: with Crohn disease
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    Case 3: normal small bowel on cine MRI sequence
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    Case 4: carcinoid on small bowel MRI
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