How long a brain tumor can live without surgery depends on factors such as the benignity of the brain tumor, the size of the brain tumor, and the degree of malignancy of the brain tumor. If the brain tumor is benign and small in size, such as a small meningioma, the tumor grows slowly. Patients can survive for a long time, and only when the tumor grows to a large size may the patient’s life be endangered, and it is possible for the patient to survive for more than ten years. If the brain tumor is large in size and malignant, the tumor will destroy the surrounding brain tissues seriously, and the tumor will grow rapidly, which will cause obvious edema in the surrounding brain tissues and increase the intracranial pressure, the patient’s survival period will be shorter, such as the most malignant brain tumor in the skull, glioblastoma. For example, the most malignant brain tumor in the skull, glioblastoma, has the highest malignancy. Even with surgery plus radiotherapy, its average survival period is only 12-14 months, and without surgery, the average survival period is only about three months.