Gamma Knife is used for surgery and the length of the edema period must be determined by the site of the surgery. In the case of edema in the soft tissues of the skin or muscles, it usually takes about 2-3 days for the swelling to completely subside. However, in the case of abdominal or uterine adnexal surgery, the edema period is about 3-5 days. But in the case of surgery on the brain, if the tissue or tumor is removed with the Gamma Knife, the edema period is the longest and must be 5-7 days or longer. If you want to relieve the edema of the brain, you can apply mannitol or tachyphylaxis intravenously after the operation to eliminate the edema of the brain.