Fig. 1

BA-specific staging system. Diagrammatic representation of the six stages (1–6) of the Ishak fibrosis score compared to the four stages (1–4) of the Metavir fibrosis score and the four stages (1–4) of the BA-specific fibrosis score. Dark circles indicate portal areas, open circles indicate the walls of central veins, spike-like septa indicate fibrous expansion of portal tracts. 1–4 corresponding to BA-specific stage 1–4 respectively (40x total magnification)