The number of Gamma Knife treatments is variable and generally requires 2 to 20 treatments. If the tumor is far from sensitive organs, the tumor volume is small, and the patient is generally well, 2 to 5 treatments are usually needed, with a relatively high dose per treatment. If the tumor is less than 5.0 cm in size and the patient is generally well, 5 to 10 treatments are generally required, with a medium dose per treatment. If the tumor is adjacent to a sensitive organ, the tumor volume is large, and the patient’s general condition is poor, 5 to 20 treatments are usually needed, with a relatively small dose per treatment. When using Gamma Knife to treat tumors, it is necessary to judge the type of tumor, the size of the tumor, the general condition of the patient, etc., the severity of the disease, and then choose the appropriate number of radiotherapy sessions. Patients are advised to seek timely medical treatment to avoid aggravation of the condition.