Patient: Patient male 43 years old onset of dizziness a week ago tumor is located in the left parietal sickle diameter of about 2 centimeters deep surgical resection is more dangerous None In view of the deep location of the tumor want to know the risk of surgical treatment and success rate if the treatment with gamma knife recurrence can continue to do gamma knife? Gamma knife treatment tumor control rate is very high, the general safety is also high, but some patients may not be effective control, there are patients will occur around the tumor brain edema, very few patients will also be more serious. It is better to see the film in person and then communicate. Patient: Thank you. How long should I stay in the hospital for observation after Gamma Knife treatment? How long should I stay in the hospital for observation after Gamma Knife treatment? Postoperative edema is a rare occurrence, and the duration can vary from a few months to several years. The most important thing after the treatment is to follow the doctor’s request for a review.