Fat ring sign (mesenteric panniculitis)

The fat ring sign (also known as a fat halo sign) describes preservation of fat around the mesenteric vessels and around soft tissue nodules on a background of diffuse fat stranding in patients with mesenteric panniculitis or mesenteric lipomas

This finding may help distinguish mesenteric panniculitis (fat ring sign present) from other mesenteric processes such as lymphoma, carcinoid tumor, or carcinomatosis (fat ring sign absent).

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Article information

rID: 12947
Section: Signs
Synonyms or Alternate Spellings:
  • Fat halo sign of mesenteric panniculitis
  • Fat ring sign of mesenteric panniculitis

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Cases and figures

  • Case 1: fat ring sign
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  • Case 1: fat ring sign (annotated)
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  • Case 2
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  • Case 3
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  • Case 4
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  • Case 5: mesenteric lipoma
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