There is a clear demarcation between the atrophied liver and the adjacent normal liver; 2. The proximal opening of the bile ducts of the affected liver segment or lobe is often narrowed, and improper treatment may lead to incomplete resection, residual stones, or damage to the bile ducts of the adjacent liver segment or lobe; 3. 4.The intrahepatic bile ducts have various variants, and improper treatment may easily cause residual stones or damage the bile ducts of adjacent liver segments or lobes; 5.The bile ducts may be complicated by cholangiocarcinoma at the same time, and the resected specimens should be carefully examined with rapid pathology, and radical surgery should be performed if necessary.