When doing the examination found that the patient’s maxillary sinus mucosa has cyst formation, whether it is serious mainly depends on the size of the patient’s cyst. If the cyst is relatively small, and the patient usually has no special symptoms, its not serious, regular review can be. If the patient has numbness in the face or repeated yellow water in the nasal cavity, it means that the cyst is relatively large and often breaks down, which is more serious, and it is recommended to consider surgical treatment. Surgery is performed under nasal endoscopy using an open window in the lower nasal passage to completely remove the cyst from the patient’s maxillary sinus, and if the cystic skin is cleaned up, the chances of recurrence after the surgery will be very small. The hospitalization time is around one week and the patient needs to return to the hospital for a follow-up examination after the surgery to clarify the recovery.