Non-alcoholic fatty liver disease (NAFLD) is the most common cause of chronic liver disease, ranging from pure steatosis to non-alcoholic steatohepatitis and ultimately to liver cirrhosis. In order to study the association between NAFLD and nephrolithiasis while minimizing the confounding effect of metabolic syndrome, we investigated the impact of different degrees of NAFLD severity on potential risk factors for stone formation.

Inclusion Criteria:

• subject >= 18 years old
• able to sign the ICF
• Liver biopsy with report compatible with NAFLD

Exclusion Criteria:

• alchol use > 20g/die
• other causes of liver disease
• active neoplasm

40 subjects suffering from NAFLD histologically ascertained by routine liver biopsy performed at the P.O. liver surgeries Columbus relating to the Gastroenterology Area Units.