Stratified Attenuation, Double Halo Sign, and Target Sign

Abstract

Stratified attenuation of bowel segments may take the form of a double circlet (with internal layer of low density and external layer of high density) forming the “double halo” sign or a target (with internal and external layers of high density and middle zone of low density) forming the “target” sign (↑).

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Stratified attenuation of bowel segments may take the form of a double circlet (with internal layer of low density and external layer of high density) forming the “double halo” sign or a target (with internal and external layers of high density and middle zone of low density) forming the “target” sign (↑). These signs usually reflect acute inflammation or ischemia. The layers with high density mean hyperemia and the layers with low density mean edema.