A female patient with a history of hepatitis B and a family history of liver cancer was admitted some time ago. Because of the discovery of abdominal occupancy, she visited the clinic to check CT suggesting a huge occupancy in the left lobe of the liver, more than 10 centimeters large, equivalent to the size of a handball. Because the person was thin, the shape of the tumor could be seen on the stomach. The tumor was not only large, but also tightly compressed several most important blood vessels of the liver, which led to the difficulty and risk of surgery, so it was once thought that there was no chance of surgery. After the patient was hospitalized, we carefully analyzed the condition and the location of the tumor. Surgery was the only effective treatment option for such a large tumor, and the CT presentation of the tumor was not typical of hepatocellular carcinoma, and effective drug therapy could not be given while the nature of the tumor was still in doubt. We thought about the possibility of rupture of the tumor, and the results of the laparotomy showed a bloody peritoneal fluid, confirming our suspicions. At this point, surgery was the only effective treatment and had to be performed as soon as possible. Because the tumor was huge and ruptured, it was impossible to remove it completely without surgery, and it could also lead to further life-threatening hemorrhage and increase the chance of abdominal implantation and metastasis with time delay. Secondly, there is no way to give effective drug treatment when the nature of the tumor is not completely clear. Surgery is the best way to obtain pathological information about the tumor. Therefore, after thorough preparation, the surgery was carried out as planned and it went smoothly. The operation time was 90 minutes, including 24 minutes for tumor resection and 500 ml of bleeding, preserving several important liver vessels and ensuring clean tumor removal while preserving enough liver to maintain normal physiological functions. The resected tumor was about 16cm in diameter and weighed more than 4cm. The patient was strong and recovered well after the operation, and was discharged from the hospital in 7 days with stitches removed. About two weeks later, the pathology department gave a cautious report: adult type hepatoblastoma. This is a type of tumor that comes from the embryo, that is, malignant liver cells with congenital dysplasia. This type of tumor is rare and is usually seen in children. All of the previous surgeries we have performed have been in children, the youngest being 18 months. The occurrence of this type of tumor in adults can be called rare, so it is no wonder that the pathology department is cautious and prudent in issuing reports. So it is strange to see more of anything, so when making treatment decisions, it is necessary to consider more possible cases, even rare ones, in order to get the best treatment results.