Whether or not an arachnoid cyst can be vaccinated with the NeoCrown vaccine depends on the condition of the cyst. If the arachnoid cyst is small and the patient is not experiencing any discomfort, the doctor usually recommends conservative treatment and the vaccine can be administered. If the size of the arachnoid cyst is large, surgery is usually required, and the vaccination is not conducive to the recovery of the patient, and the effect of the vaccine is easily affected. It is necessary to wait until the patient has recovered from surgery before administering the vaccine. If there are any abnormalities in the body during the vaccination, the patient should take into account his/her own situation and ask the doctor if he/she can be vaccinated with the vaccine.