Quality and quantity of the information from CT of nose and paranasal sinuses depends on keeping some rules concerning the stage of performing the examination and the stage of its evaluation and applying current anatomic terminology.

Endoscopic sinus surgery is an effective treatment for retention cysts and should be widely used. Computer tomography should be performed before each procedure.

Endoscopic sphenoidotomy is an effective and safe method of treatment of the isolated sphenoid sinus diseases. Nasal endoscopy and CT imaging are necessary for a precise diagnosis and treatment decision.