The need for surgery for a left sieve sinus osteoma should be determined based on the size of the tumor, symptoms, and so on. If the size of the tumor is small and there is no obvious symptom, no surgery is needed; if the tumor is large and there is obvious uncomfortable symptom, surgery is recommended. 1. No need for surgery: if the size of the left sieve sinus osteoma is small and there are no obvious clinical symptoms, usually no special treatment is taken, and regular review of X-ray is enough to understand the changes of the osteoma. 2. Surgery is recommended: If the size of left sieve sinus osteoma is large, causing obvious clinical symptoms, such as headache, nasal congestion, tearing, displacement of eyeballs, etc., surgery is recommended. Surgical removal of localized lesions can achieve the purpose of treatment. When left sieve sinus osteoma is found, it is recommended to consult a professional doctor to decide whether surgery is needed according to the specific situation.