Hemilunar ganglion microballoon compression for trigeminal neuralgia is another option for elderly and frail patients, especially for patients who are not suitable or cannot tolerate open microvascular decompression surgery. 1. Treatment principle: Through C-arm guidance, precise localization of the foramen ovale, puncture, and mechanical compression of the semilunar ganglion after microballoon expansion, the following can be achieved: (1) changes in trigeminal nerve root position, shortening of the cerebral pool segment, focal axonal injury and demyelination changes; (2) slight hemorrhage and small round cell infiltration in the ganglion. It leads to the destruction of defective coarse myelin sheaths and abnormal neurons associated with trigeminal neuralgia, and achieves the treatment purpose of relieving facial pain. 2. Advantages: (1) The requirements for patients’ basic conditions are relatively low. As long as coagulation dysfunction and severe bradycardia unresponsive to atropine are excluded, general patients can tolerate the surgery. In China, the oldest patient who successfully performed this procedure was 98 years old. (2) Less patient pain, intraoperative general anesthesia, no pain during puncture, while local anesthesia puncture during radiofrequency treatment, especially when entering the foramen ovale, the patient is in abnormal pain, and the trigeminal nerve inhibition reflex is strong. (3) Short hospitalization time, generally 2-3 days of surgery can be discharged . (4) The cost of the operation is low, and the total cost of the treatment of this technology in our department is about 10,000 yuan at present.