Primary Versus Secondary NAFLD: Perspective on Advanced Fibrosis

Area of Science:

• Hepatology
• Gastroenterology
• Pathology

Background:

• Macrovesicular steatosis is a common liver biopsy finding, defining nonalcoholic fatty liver disease (NAFLD) when alcohol use is excluded.
• NAFLD is categorized into primary and secondary types, with limited understanding of their distinct histopathological characteristics and fibrosis progression.

Purpose of the Study:

• To investigate the histopathological differences between primary and secondary NAFLD.
• To compare the prevalence of advanced fibrosis in primary versus secondary NAFLD.

Main Methods:

• Retrospective analysis of 90 liver biopsies with ≥5% macrovesicular steatosis over three years.
• Evaluation of histopathological features including steatosis, inflammation, ballooning degeneration, Mallory Denk bodies, glycogenated nuclei, and fibrosis stage.
• Statistical comparison of demographic, clinical, and histopathological data between primary and secondary NAFLD groups.

Main Results:

• Primary NAFLD (46.7%) and secondary NAFLD (53.3%) showed significant differences in ballooning degeneration, Mallory Denk bodies, glycogenated nuclei, and fibrosis stage (p < 0.05).
• The overall prevalence of advanced fibrosis was 24.4%.
• No significant differences were observed in AST/ALT ratio, steatosis, or inflammation grade between the two groups.

Conclusions:

• Primary NAFLD is characterized by more severe histopathological findings, including a higher prevalence of ballooning degeneration, Mallory Denk bodies, glycogenated nuclei, and advanced fibrosis.
• These findings suggest that primary NAFLD represents a more aggressive form of liver disease compared to secondary NAFLD.