Nonalcoholic steatohepatitis (NASH) is the most severe form of non-alcoholic fatty liver disease (NAFLD). The aim of our study was to highlight NASH as a rare but possible problem in children. We present a case of 13-yr-boy with a well-established diagnosis of liver cirrhosis secondary to NASH, who underwent orthotopic liver transplantation (OLT) at the age of 13 years. Six months after transplantation recurrence of NASH in the graft was diagnosed. In the treatment metformin was used with good effect.