The operation will be done endoscopically. It would be better done with the help of an instrument called a microdebrider, which is not available at all places. Any surgery has some risks and you would be better off discussing them with your doctor. Allergic fungal sinusitis is due to you having a severe allergy to some fungus present in your nose. Surgery may cure you and it will definitely bring you relief. You will require to be put on oral steroids to prevent recurrence.