Typical case: The patient, female, 59 years old, was admitted to the hospital with “right upper abdominal discomfort with hypothermia for more than half a month”. External CT showed “irregular mass-like hypointense shadow in the right lobe of the liver 7.5×162.5px, dilated common bile duct and intrahepatic bile duct”. After admission, magnetic resonance examination showed that the tumor occupied the right liver and left inner lobe, invaded the hepatic hilum up to the sagittal part of the left liver, the right branch of portal vein was invaded without shadowing, the right hepatic lobe was atrophied, the left outer lobe was compensated enlarged, and the left intrahepatic bile duct was dilated. Hepatitis B two-to-one negative, ICG-15 <1.9%. Through careful analysis of the preoperative images and discussion, it was concluded that the left branch of portal vein and left hepatic artery were not invaded, and the compensatory enlargement of the left outer lobe had reached more than 50% of the standard liver volume. The operation went smoothly as planned. Postoperative pathology showed bile duct cell carcinoma with negative bile duct margins and metastases in 2/5 of the hilar lymph nodes. On the first day after surgery, liver function showed normal bilirubin, glutathione 96 U/L and glutathione 526 U/L, and he was discharged from the hospital without any problems.