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[Non-alcoholic steatohepatitis : pathology and pathogenesis]
Chikako Namikawa1, Hui Zhang, Makoto Toi
1Department of Pathology, Kochi Medical School, Kochi University.
Nihon Rinsho. Japanese Journal of Clinical Medicine
|June 14, 2006
Summary
Nonalcoholic steatohepatitis (NASH) involves liver fat accumulation and subsequent injury. Histopathology is crucial for diagnosing NASH, as imaging and lab tests cannot detect its key features.
Area of Science:
- Hepatology
- Gastroenterology
- Pathology
Background:
- Nonalcoholic steatohepatitis (NASH) is a major cause of chronic liver disease.
- NASH development is theorized to involve a "double hit" mechanism.
- The "first hit" is hepatic steatosis, followed by inflammation and fibrosis (the "second hit").
Purpose of the Study:
- To highlight the key histopathological findings in NASH.
- To emphasize the diagnostic importance of specific microscopic features.
- To underscore the necessity of liver biopsy for accurate NASH diagnosis.
Main Methods:
- Histopathological evaluation of liver biopsies.
- Microscopic examination for characteristic NASH features.
- Correlation of histological findings with disease progression.
Main Results:
- Microscopic findings include steatosis, ballooning degeneration, Mallory bodies, inflammation, and fibrosis.
- Ballooning degeneration and Mallory bodies indicate progressive NASH.
- Parenchymal injury and fibrosis in NASH are not detectable by imaging or laboratory tests.
Conclusions:
- Accurate diagnosis of NASH relies on histopathologic assessment.
- Identifying specific features like ballooning and Mallory bodies is vital for staging NASH.
- Liver biopsy remains the gold standard for diagnosing NASH and its complications.