The side effects of Gamma Knife treatment for meningioma mainly include peritumoral delayed radiation brain edema, cerebral neurological function impairment, cognitive function impairment and other aspects. 1. Delayed peri-tumor radiation cerebral edema: Clinical studies have shown that the prevalence of potential delayed radiation cerebral edema of cerebral convexity and paraventricular sinus meningiomas increases after Gamma Knife treatment, and it is feasible to have nuclear magnetic resonance examination to clarify whether the edema is generated and the location of the edema after the operation. 2. Impairment of cerebral nerve function: visual impairment, facial paralysis, facial sensory impairment and other symptoms may appear after surgery, which may be caused by tumor compression and surgery. 3. Cognitive impairment: Some studies have pointed out that there is a decline in memory (including transient memory and delayed recall), visuospatial and executive power, and attention in patients 6 months after surgery compared with preoperative assessment, and the occurrence of cognitive impairment may be related to the margin dose and tumor site. Whether or not a patient will be treated with the gamma knife treatment plan needs to be evaluated by a medical professional and then a comprehensive judgment is made.