Published online Dec 27, 2014. doi: 10.4254/wjh.v6.i12.894
Revised: October 9, 2014
Accepted: October 28, 2014
Published online: December 27, 2014
Core tip: The differentiation between nonalcoholic steatohepatitis and simple steatosis can be done only by liver biopsy. Through many proposals and revisions, the histological criteria for the differentiation have been changed. The changes in the criteria during the last three decades are exhibited in this review article, with a special interest in “hepatocellular ballooning”.