NASH and cryptogenic cirrhosis: a histological analysis.

Area of Science:

• Hepatology
• Gastroenterology
• Pathology

Background:

• Nonalcoholic steatohepatitis (NASH) is increasingly recognized as a cause of cryptogenic cirrhosis.
• Histological examination of cirrhotic livers may lack definitive NASH features, complicating diagnosis.
• Understanding residual histological findings is crucial for identifying prior NASH in cryptogenic cirrhosis.

Purpose of the Study:

• To investigate residual histological features in patients with prior non-cirrhotic NASH who developed cryptogenic cirrhosis.
• To compare these features with cirrhosis due to hepatitis C.

Main Methods:

• Retrospective analysis of biopsy pairs from seven patients with prior non-cirrhotic NASH and subsequent cryptogenic cirrhosis.
• Blind scoring using an expanded NASH-CRN system.
• Comparison with 13 patients with cirrhosis due to hepatitis C.

Main Results:

• Macrosteatosis decreased in advanced NASH and was not a distinguishing feature.
• Ballooned cells, Mallory-Denk bodies, megamitochondria, and absence of apoptotic bodies were significantly different in cirrhotic NASH versus hepatitis C-related cirrhosis.
• Histological findings in advanced NASH were distinct from viral hepatitis.

Conclusions:

• Advanced NASH can present as cryptogenic cirrhosis with residual histological changes.
• These histological findings support the association between NASH and cryptogenic cirrhosis.
• The study provides histological evidence for proposed classifications of cryptogenic cirrhosis.