The pathology of hepatitis C

Area of Science:

• Hepatology
• Virology
• Pathology

Background:

• Hepatitis C virus (HCV) infection is a significant global health concern.
• Accurate histologic diagnosis is crucial for managing chronic liver disease.
• Understanding the specific liver biopsy findings in hepatitis C is essential for differentiation from other hepatitis types.

Purpose of the Study:

• To define the characteristic histologic patterns observed in liver biopsy specimens from patients diagnosed with chronic hepatitis C.
• To evaluate the prevalence of specific features, such as lymphoid follicles, in hepatitis C liver histology.
• To assess the diagnostic utility of observed histologic patterns, particularly lymphoid aggregates, in identifying hepatitis C.

Main Methods:

• Analysis of 54 liver biopsy specimens from 45 patients with a confirmed clinicopathological diagnosis of hepatitis C.
• All patients tested seropositive for antibodies against hepatitis C virus using second-generation assays.
• Inclusion of both transfusion-related and sporadic cases of hepatitis C.

Main Results:

• Over half of the samples exhibited chronic hepatitis without cirrhosis; 44% showed developing or established cirrhosis.
• A common histologic pattern included mild chronic hepatitis with portal lymphoid follicles and lobular activity.
• Prominent lymphoid aggregates or follicles were present in 78% of hepatitis C biopsy specimens, compared to 52% in hepatitis B samples.

Conclusions:

• A distinct histologic pattern is associated with chronic hepatitis C, though not universally present.
• Prominent lymphoid follicles serve as a valuable diagnostic clue for hepatitis C, despite not being exclusive to it.
• Histologic evaluation of liver biopsies remains important for diagnosing and understanding the spectrum of chronic hepatitis C.