Contrast-enhanced CT image (coronal reformat) shows circumferential zone of low attenuation around the portal vein branches. Seen en face (arrows) and in profile (arrowheads).
Features of Periportal Halo
- Circumferential (differentiating feature from dilated bile ducts)
- Low attenuation (could represent fluid, lymph, or blood)
- Peripheral portal veins
- Liver trauma (blood tracks in periportal space)
- Edema (CHF, burn, volume resuscitation)
- Lymphatic obstruction (obstructing portal lymph nodes or malignancy)
Our patient is a young man with toxic hepatitis. Periportal halo is due to his hepatitis.
Lawson TL, et al. Periportal halo: a CT sign of liver disease. Abdom Imaging 1993;18:42.