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Sentinel loop

A sentinel loop is a short segment of adynamic ileus close to an intra-abdominal inflammatory process.

The sentinel loop sign may aid in localizing the source of inflammation. For example, a sentinel loop in the upper abdomen may indicate pancreatitis, while one in the right lower quadrant may be due to appendicitis.

  • Focal ileus 
  • Small bowel obstruction
Next best radiological step:
  • CT of the abdomen
See also

Article information

rID: 2031
Section: Signs
Synonyms or Alternate Spellings:
  • Sentinel loops
  • Sentinel bowel loop

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Cases and figures

  • Case 1: due to acute appendicitis
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