What is the definition of periportal halo sign?
Periportal halo or periportal collar sign is a zone of low attenuation seen around the portal vein on contrast enhanced CT. Periportal haloes may occur around the central portal veins or their peripheral branches.
What are the DDx of periportal halo?
This sign is nonspecific and can be seen in various conditions as: congestive cardiac failure secondary cardiac congestion acute hepatitis lymphadenopathy at the porta hepatis liver transplant bone marrow transplantation blunt hepatic trauma
What are the DD of periportal hypoechogenicity?
Periportal hypoechogenicity can result from many causes: orthotopic liver transplant rejection congestive hepatomegaly malignant lymphatic obstruction cholangitis viral hepatitis
Enlarged liver of homogenous CT texture. It has periportal tracking with halo and hypoattenuation suggesting edema. Gall bladder has marked wall thickening with contracted lumen and hyperdense inner wall. No visible calculi inside. Multiple small porta hepatis lymph nodes are seen associated with mild fat stranding.