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Examples of biopsy samples from patients with hepatitis C and fibrosis stages 0 to 4 according to the METAVIR staging system based on Masson's trichrome stain (2.5× to 10× magnification). Fibrosis stage 0: no fibrosis; fibrosis stage 1: mild portal and periportal fibrosis; fibrosis stage 2: portal fibrosis with few septa; fibrosis stage 3: more severe bridging fibrosis; and F4: cirrhosis. Figure 1 can be viewed online in color at www.topicsinmri.com.
