XXXX : spectrum of appearances of acute, subacute, and @entity102 with magnetic resonance imaging.

@entity1 @entity49 @entity102 @entity3181 @entity2287
The purpose of this study was to describe our collective experience in the magnetic resonance (MR) investigation of @entity1 with proven acute, subacute, and chronic @entity3181 and to demonstrate the spectrum of appearances on T1- and T2-weighted as well as dynamic post- @entity2287 spoiled gradient-echo imaging. All @entity1 with proven @entity3181 who underwent MR examinations between June, 1992 and October, 1998 were included in the study. Fourteen @entity1 were included in the study: four with acute, three with subacute, three with chronic, and four with acute superimposed on either subacute (two) or chronic (two) @entity3181 . MR imaging features were retrospectively evaluated to determine: a) liver morphology, b) pattern of signal intensity (SI) on T1-weighted images, c) pattern of SI on T2 weighted images, d) dynamic enhancement characteristics, e) presence or absence of visible @entity49 , and f) presence or absence of venous macroscopic collaterals. The MR findings were correlated with surgical, histopathological, and laboratory data to determine imaging characteristics related to the chronicity of the disease process. @entity49 or absence of hepatic venous flow was demonstrated in all @entity1 in the study. In the four @entity1 with acute @entity3181 , the liver periphery was moderately low signal on T1 and moderately high signal on T2-weighted images relative to the central liver; both early and late @entity2287 -enhanced images revealed diminished peripheral enhancement. In the three @entity1 with subacute @entity3181 , the liver periphery was moderately low signal on T1, and moderately high signal on T2-weighted images, while early and late @entity2287 -enhanced images revealed heterogenously increased enhancement within the liver periphery. In the three @entity1 with chronic @entity3181 , the SI differences between peripheral and central liver were minimal on T1- and T2-weighted images, and enhancement differences were also minimal. Extensive bridging intrahepatic and capsular venous collaterals were visualized in chronic cases. In the four @entity1 with acute @entity3181 superimposed on more @entity102 , a combination of @entity2287 enhancement patterns was observed on MR images. Enhancement patterns between central and peripheral liver were different for acute, subacute, and chronic @entity3181 , suggesting differentiation between these phases of the disease process. Application of this pattern approach permitted recognition of acute changes superimposed on more @entity102 .
