Hepatic hemangioma is the most common benign tumor of the liver.For huge liver hemangioma, however, it need to use the conventional radiofrequency ablation can increase one-time ablation volume of radiofrequency electrode or enhance ablation power and extend the melting time, not only bring patients suffering discomfort, but easy to damage the adjacent organs, causing serious complications such as hemorrhage, perforation of gastrointestinal tract,acute renal failure .Therefore, the investigators have developed a new, standardized radiofrequency ablation for giant hepatic hemangioma to shorten the duration of treatment, reduce surgical complications and improve the surgical success rate.

The purpose of this study was to evaluate the safety, feasibility and efficacy of the new radiofrequency ablation (" three-step "radiofrequency ablation) in the treatment of giant hepatic hemangioma.

Hepatic hemangioma is the most common benign tumor of the liver, with an incidence of 0.4-20% in the general population.For small and asymptomatic patients with hepatic hemangioma, regular reexamination is necessary without medical intervention.However, patients with giant hepatic hemangioma(diameter ≥ 5cm) may have symptoms such as abdominal pain, indigestion, jaundice, or rapid increase in lesion volume, or even spontaneous rupture and hemorrhage, which require active treatment.Currently, surgical resection is the most effective method for the treatment of hepatic hemangioma, but the incidence and mortality of related complications have been reported as high as 27% and 3% respectively

.Other alternative therapies, such as transcatheter arterial embolization, radiotherapy and steroid therapy, have also been reported for the treatment of hepatic hemangioma, but the efficacy is not satisfactory .

Percutaneous ultrasound-guided radiofrequency ablation is a safe and minimally invasive treatment with reliable efficacy. In recent years, this technique has been successfully applied in the treatment of hepatic hemangioma with a diameter of < 5cm.For huge liver hemangioma, however, need to use the conventional radiofrequency ablation can increase one-time ablation volume of radiofrequency electrode or enhance ablation power and extend the melting time, not only bring patients suffering discomfort, but easy to damage the adjacent organs, causing serious complications such as hemorrhage, perforation of gastrointestinal tract, acute renal failure .Therefore, the investigators have developed a new,standardized radiofrequency ablation for giant hepatic hemangioma to shorten the duration of treatment, reduce surgical complications and improve the surgical success rate.

The purpose of this study was to evaluate the safety, feasibility and efficacy of the new radiofrequency ablation (" three-step "radiofrequency ablation) in the treatment of giant hepatic hemangioma.

Inclusion Criteria:

1. Definite diagnosis of hepatic hemangioma (more than two imaging evidences: enhanced ultrasound or enhanced CT and MRI), single tumor, 5-15cm in diameter;
2. The Child-Pugh grade A/B;
3. The ICG15 20% or less;
4. The eCOG score was 0;
5. The patients was persistent hemangioma-related abdominal pain or discomfort, and it has clear exclusion of other gastrointestinal diseases causing upper abdominal pain by gastroscopy;
6. The patients refused to receive surgical treatment, but agreed to receive radiofrequency ablation;
7. There were no other related diseases affecting RFA treatment.

Exclusion Criteria:

1. Multiple hepatic hemangioma lesions or single lesion < 5cm;
2. Severe primary organ failure, such as liver, kidney, heart, lung or brain;
3. Severe bleeding tendency, platelet count < 50 ×10^9/L, or prothrombin time extension > 18s;
4. Previous treatment of hepatic hemangioma (TACE, steroids, etc.).