CT scan 3 months after surgery. Healthy nasal endoscopy is associated with 80% recovery of sense of smell. (a) Permeabilization of both middle meatus (arrows). The right maxillary sinus is free. Persistence of a stage 1 non-obstructive polyp of the floor of the left maxillary sinus (p); (b) Ethmoidal (+) and sphenoidal (#) sinuses are free. The SNP is controlled and sinus lift surgery can be performed.