Sinonasal inflammatory disease is extremely common, with nearly all individuals experiencing symptoms at some point due to infection, allergy or other causes.

Endonasal surgery is currently extending its application beyond inflammatory sinonasal lesions to successfully treat both benign and malignant neoplasms. This progression has been possible by the detailed information provided by imaging techniques (CT, MRI and PET).

Inflammatory diseases are the “domain” of CT. CT provides excellent details about the thin bony sinonasal walls separating the ethmoid from the anterior skull base and the orbit.