Diagnostic value of gadobenate dimeglumine-enhanced hepatocyte-phase magnetic resonance imaging in evaluating hepatic fibrosis and hepatitis

Figure 2 Schematic diagram of staging of hepatic fibrosis. S1: Portal fibrosis characterized by mild fibrous expansion of portal tracts; S2: Periportal fibrosis showing fine strands of connective tissue in zone 1 with only rare portal-portal septa; S3: Septal fibrosis manifested by connective tissue bridges that link portal tracts with other portal tracts and central veins; minimally distorted architecture, but no regenerative nodules; S4: Cirrhosis showing bridging fibrosis and nodular regeneration.