Abstract
The inner layer of soft-tissue attenuation represents the bowel (small and/or large) mucosa, while the layer of low attenuation ( 18 to 64 HU) results from widening and fatty infiltration of the submucosa. The outer soft-tissue attenuation layer represents the muscularis propria and serosa (2,4,6–8). The fat halo sign can be depicted on CT scans obtained without intravenous (IV) contrast material because of the marked differences in tissue attenuation (3). However, the different layers of attenuation can also be appreciated during the late arterial and early portal venous phases of IV contrast enhancement (3,7).
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