Frontal sinus approach in complicated chronic rhinosinusitis with nasal polyps: Our experience.

Background: Hyperostosis is a common consequence of chronic rhinosinusitis with nasal polyps (CRSwNP) and other chronic rhinosinusitis, affecting mainly structures of the ethmoid labyrinth, frontal and maxillary sinuses. These neo-bones are found in advanced stages of rhinosinusitis causes exacerbation because of ostia outflow blockage. Frequent relapses of the disease due to hyperostosis restenosis, represent a problem in the treatment of chronic frontal sinusitis.