Figure 4.

Pathologically proven autoimmune hepatitis-primary biliary cirrhosis overlap syndrome in a 63-year-old woman. Serological assays for antimitochondrial and anti-M2 antibodies were positive. (a) T2-weighted image shows periportal halo sign as hypointense areas around portal vein branches (arrows). (b) Precontrast T1-weighted image with fat suppression shows periportal liver parenchyma as slightly hyperintense areas. (c) Gadoxetate-disodium enhanced image obtained during the portal venous phase shows homogeneous enhancement of the liver parenchyma including periportal areas. (d) Gadoxetate-disodium enhanced image obtained during the hepatobiliary phase shows periportal areas with moderate enhancement. The periportal enhanced areas located immediately external to the periportal T2-hyperintense areas (noncorresponding periportal enhancement pattern).