The fat ring or fat halo sign (Fig 1) describes the CT appearance of the infiltration of the central mesenteric soft tissues with preservation of a distinct circumferential rim of fat immediately surrounding the mesenteric vessels, typically seen in sclerosing mesenteritis (Fig. 2A, B) [1]. A chronic subtype of mesenteric panniculitis, sclerosing mesenteritis is a primary, idiopathic inflammatory, and fibrotic process that affects the small bowel mesentery.
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