All of the following are diagnostic criteria of allergic Fungal sinusitis except:: (A) Areas of High Attuenuation on CT scan, (B) Orbital invasion, (C) Allergic eosinophilic mucin, (D) Type 1 Hypersensitivity
Answer is B. Allergic fugal sinusitis is a non invasive form of fungal sinusitis as such orbital invasion is not its feature. Ref Pattern's Allergic Disease 6/e,p 778.