To evaluate the diagnostic performance of quantitative ultrasound parameters for assessing hepatic steatosis in non-alcoholic fatty liver disease using histologic results as reference standard

Inclusion Criteria:

• Clinically suspected or proven nonalcoholic fatty liver disease (NAFLD)
• Patients who are scheduled hepatic parenchymal biopsy for suspected liver disease or hepatectomy for living donor liver donation
• aged ≥ 18 years who are willing and able to complete all procedures

Exclusion Criteria:

• excessive alcohol consumption within 2 years (40g/day for men, 20g/day for women)
• clinical, laboratory, or histologic evidence of a liver disease other than NAFLD, including viral hepatitis, autoimmune hepatitis, or genetic or acquired disorders
• use of steatogenic or hepatotoxic medication
• evidence of decompensated liver disease
• history of liver surgery
• any other condition believed by investigator to affect a patients' compliance, or completion of the study

Clinically suspected or proven nonalcoholic fatty liver disease (NAFLD)