There are benign and malignant tumors of the liver. Benign tumors of the liver are uncommon. Malignant tumors of the liver are mainly primary and secondary hepatocellular carcinoma. Other malignant tumors such as hepatic sarcoma and malignant hemangioendothelial cell tumor are rare. In clinical practice, liver tumors are usually treated with a combination of surgery, radiotherapy and traditional Chinese medicine in western medicine, but the cure rate of late stage patients is low due to the spread of tumor cells, so it is necessary to achieve early detection, early diagnosis and early treatment of liver tumors. Liver tumor treatment methods currently include: surgical resection, hepatic artery vascular embolization, alcohol injection method, cryotherapy, radiofrequency ablation, etc. For patients who are not suitable for percutaneous radiofrequency ablation, laparoscopic or open radiofrequency is also available. What is radiofrequency ablation? Radiofrequency is a high frequency vibration with a frequency of 150,000 times per second. Under the action of high-frequency alternating current, the direction of change in the concentration of ions varies with the direction of the current in a positive and negative semicircular round trip. Under the high frequency oscillation, the ions between the two electrodes move rapidly along the direction of power line and gradually change from moving state to vibrating state. Due to the poor heat dissipation of tumor, which makes the temperature of tumor tissue higher than its adjacent normal tissue, coupled with the sensitivity of cancer cells to high heat, high heat can kill cancer cells. Who can undergo radiofrequency ablation? 1.The diameter of single tumor lesion≦5cm, the diameter of multiple tumor lesions≦3 cancer lesions, the diameter of the largest tumor lesion≦3cm; 2.Tumor recurrence after surgical resection, the tumor size characteristics are the same as the above requirements; 3.Tumor boundary is clear and there is enough safety range for tumor extinction; 4.No extrahepatic metastasis. Who must not undergo radiofrequency ablation? 1.Patients with extrahepatic metastasis of hepatocellular carcinoma; 2.Patients with severe cardiopulmonary and cerebral diseases that cannot tolerate radiofrequency treatment; 3.Patients with severe liver insufficiency, liver function Child C level; 4.Patients with severe coagulation disorders. Radiofrequency ablation process? 1.Anesthesia: can be performed under intravenous anesthesia or local anesthesia combined with intravenous anesthesia, sedative and analgesic drugs can be added when using local anesthesia; 2.Guidance: guided by B ultrasound, when the tumor is located at the top of the diaphragm with pulmonary air flexure, it can be performed under CT localization guidance; 3.Ablation route: there are three kinds of ablation: percutaneous, laparoscopic and open; 4.Ablation range: after puncture and placement of RF electrode, the operation is completed according to the instruction of RF transmitter. The ablation process, the ablation range must completely cover the tumor range and exceed its boundary by 0.5-1cm. Common problems after radiofrequency ablation Close monitoring of vital signs and changes in abdominal conditions after surgery to prevent complications; bleeding and biliary fistula are more serious complications, but the incidence is low; local distension and pain or fever are more common after ablation, which usually only need symptomatic treatment. Postoperative ultrasound or enhanced CT is performed regularly, and changes in AFP, blood routine and liver and kidney function are checked to evaluate the efficacy and decide whether additional treatment is needed.