What is the "fat halo" sign?
It refers to the preservation of normal fat density in the fatty tissue surrounding the mesenteric vessels.
What is the tumor pseudo-capsule?
It refers to the presence of a peripheral curvilinear band of soft-tissue attenuation limiting the heterogeneous mesenteric mass from the surrounding normal mesentery.
The small bowel mesentery shows a mass-like area of heterogeneously increased fat attenuation and clumps of calcifications. There is no displacement of the traversing vascular structures. There are tumoral pseudo-capsule and fat halo signs.