<prompt> All of the following are diagnostic criteria of allergic Fungal sinusitis except:Areas of High Attuenuation on CT scanOrbital invasionAllergic eosinophilic mucinType 1 Hypersensitivity  <response>: Allergic fugal sinusitis is a non invasive form of fungal sinusitis as such orbital invasion is not its feature. Ref Patterns Allergic Disease 6e,p 778. 