Fig. 1.Bowel wall fat halo sign in 52-year-old man without
intestinal disease. Unenhanced axial CT scan obtained with patient in supine
position shows low-attenuation fat layer (arrows) in wall of
ascending colon and terminal ileum.
Fig. 2.Bowel wall fat halo sign in 50-year-old man without
intestinal disease. Unenhanced axial CT scan obtained with patient in supine
position shows low-attenuation fat layer (arrow) in rectal wall.
Fig. 3A.Bowel wall fat halo sign in 55-year-old woman without
intestinal disease. Unenhanced axial CT scan obtained with patient in supine
position shows low-attenuation fat layers (arrows) in bowel wall of
ascending and descending colon.
Fig. 3B.Bowel wall fat halo sign in 55-year-old woman without
intestinal disease. Contrast-enhanced axial CT scan obtained with patient in
prone position shows air-filled distended ascending and descending loops of
colon (arrows) with disappearance of normal fat halo sign.