<prompt> All of the following are diagnostic criteria of allergic fungal sinusitis AFS Except ?Areas of high attuenuation on CT scanOrbital invasionAllergic eosinophilic mucinType 1 Hypersensitivity  <response>: CT scan shows mucosal thickening with hyperdense areas in fungal sinusitis. Allergic fungal sinusitis is due to the type 1 hypersensitivity reaction to fungal hyphae. It presents with sinonasal polyposis and mucin. Ref: Textbook of ENT, Diseases of ENT, Dhingra, 7th edition, pg no. 220 