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Peripheral hepatolithiasis incidentally found at autopsy. A morphological study
K Saito1, T Terada, Y Nakanuma
1Second Department of Pathology, Kanazawa University School of Medicine, Japan.
Insights
Hepatolithiasis, or liver stones, are rare in the West. This study found brown pigment stones primarily in peripheral intrahepatic bile ducts, suggesting a potential origin site for these liver calculi.
Area of Science:
- Hepatobiliary Medicine
- Gastroenterology
- Pathology
Background:
- Hepatolithiasis (intrahepatic bile duct stones) is prevalent in East Asia but uncommon globally.
- Previous studies often focused on stones in major intrahepatic or extrahepatic bile ducts.
- The origin and development of stones in peripheral intrahepatic bile ducts remain less understood.
Purpose of the Study:
- To describe and characterize cases of hepatolithiasis involving peripheral intrahepatic biliary tree branches.
- To compare these peripheral calculi findings with those typically seen in major intrahepatic biliary tree stones.
- To investigate the potential origin of brown pigment stones within the liver.
Main Methods:
- Autopsy examination of four cases with incidentally discovered calculi in peripheral intrahepatic bile ducts.
- Histopathological analysis of affected bile ducts and surrounding hepatic parenchyma.
- Comparison of findings with established knowledge of hepatolithiasis involving major bile ducts.
Main Results:
- All four cases involved elderly patients (3 male, 1 female) with brown pigment stones in peripheral intrahepatic ducts.
- Affected ducts showed fibrosis, glandular proliferation, and inflammation; hepatic parenchyma was atrophic or collapsed.
- No evidence of bacterial infection or biliary anomalies was found in major or extrahepatic bile ducts.
Conclusions:
- Brown pigment stones in hepatolithiasis appear to primarily form in the peripheral intrahepatic bile ducts.
- The observed ductal and parenchymal changes suggest a localized pathological process.
- Further research is needed to determine if peripheral stones can progress to involve major bile ducts.
Abstract:
Hepatolithiasis is a common disease in East Asia though very rare in the West. Four cases of hepatolithiasis in which calculi were incidentally found in the peripheral branches of the intrahepatic biliary tree at autopsy are described and compared with hepatolithiasis involving the major branches of the intrahepatic biliary tree. These four cases were all elderly, three patients were male and one female. The calculi were brown pigment stones in each case, as seen in the major branch type. The stone-containing ducts showed mild fibrosis and glandular proliferation with inflammatory changes in three cases; these changes were marked in the fourth case. The hepatic parenchyma around the stone-containing ducts was atrophic or collapsed in all four cases. The major branches of the intrahepatic biliary tree as well as the extrahepatic tree failed to show findings suggestive of bacterial infections or biliary anomalies. These data suggest that brown pigment stones develop primarily in the peripheral ducts in the liver. It remains uncertain whether the peripheral type eventually progresses to the major type or not.