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Pediatric NAFLD: borderline type 1. This trichrome stain illustrates zone 1 steatosis, portal fibrosis, and a ductular reaction, which characterize pediatric NAFLD. This is an example of fibrosis stage 1c (portal, periportal only). Because there is no zone 3 ballooning, this cannot be diagnosed as definite NASH, but the features are more severe than those of steatosis without fibrosis (Masson's trichrome, ×20).
