European Paediatric Non-Alcoholic Fatty Liver Disease Registry (EU-PNAFLD)

Inclusion Criteria: * Diagnosis made under 18 years of age. * Diagnosis of NAFLD spectrum disease (simple steatosis (NAFL), steatosis with abnormal transaminases, NASH ± fibrosis or cirrhosis) * Diagnosis established by: * Radiological evidence of hepatic steatosis (e.g. increased hepatic echogenicity on ultrasound), with * Exclusion of secondary causes (negative serological liver screen for HBV/HCV, caeruloplasmin \>0.20g/L, no history of excess alcohol consumption, no evidence of iron overload, and no clinically significant alpha-1 antitrypsin (A1AT) phenotype (i.e. SZ, ZZ, SS), with or without * Histology (\>5% steatosis and histology consistent with paediatric NAFLD) Exclusion Criteria: * Secondary fatty liver disease (e.g. glycogen storage diseases, Wilson disease, viral hepatitis, drug-related, autoimmune hepatitis, type 1 diabetes mellitus) * Post-transplant fatty liver * \>20g/day ethanol intake