A periportal halo is a circle of decreased attenuation around the peripheral or subsegmental portal venous branches that is thought to represent fluid or dilated lymphatics in the loose tissue around the portal triad. It is a nonspecific finding that should prompt a search for underlying etiology.
Periportal halos can be seen with:
- Aggressive fluid resuscitation: The most common cause and the case shown here. Note the large caliber of the inferior vena cava.
- Tracking of blood from liver laceration
- Congestive heart failure and secondary liver congestion
- Hepatitis
- Porta hepatis mass obstructing lymphatic drainage
- Liver transplant: Disruption of lymphatic drainage
- Bone marrow transplant: Microvenous occlusive disease.
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