CT and MRI features of sclerosing mesenteritis

What are the CT and MRI features of sclerosing mesenteritis?

Subtle infiltration of the mesenteric fat is typically seen, along with slightly low signal intensity on T1-weighted images, slightly high signal intensity on T2-weighted images, and mild delayed phase enhancement relative to other fat in the body. It is located predominantly in the left abdomen in the majority of cases, and preservation of the fat about the mesenteric vessels (i.e., the “fat ring” sign) is seen in 75% of cases. Mildly prominent mesenteric lymph nodes are also seen, sometimes with preservation of the surrounding fat, and a thin enhancing peripheral pseudocapsule may also be visualized ( Figure 31-4 ). In some cases, a nonspecific well-circumscribed or infiltrative soft tissue mesenteric mass is present, which may be calcified and may tether or have mass effect upon adjacent small bowel loops.


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