(1) Mainly resulted from the large blood vessels around.
(2) Preoperative angiography can help to understand the relationship between the location of blood vessels and the location of the tumor, so as to choose the appropriate direction and position of inserting needle to reduce the probability of occurrence of this situation.
(3)Before the RF ablation, a variety of methods, such as injection of anhydrous alcohol, blocking the hepatic artery with balloon catheter and other methods, and can be used to destruct the local blood supply of the tumor.
(4)After taking back the needle, turn the needle for 45 degrees and open again, so as to avoid the blood vessel.