Allergic fungal sinusitis eroding the pterygoid plates: a rare case series.

Allergic fungal sinusitis (AFS) is a non-invasive form of allergic sinusitis, resulting from the IgE-mediated hypersensitivity reaction to fungal antigen in atopic individuals. It was first described in 1983 by Katzenstein.1 It usually follows a slow, non-aggressive course, and a wide variety of fungal agents have been implicated, with the vast majority belonging to the Dematiaceae family, such as Bipolaris spicifera or Curvularia lunata, or to the Aspergillus family, such as A. fumigatus, A. flavus, or A. niger.2,3 AFS can present with a continuum of symptoms, ranging from simple nasal obstruction to diplopia, facial deformity, osteolytic destruction, and involvement of the skull base.4 CT scan of these patients is always abnormal, and evidencing bone erosion, chronic rhino sinusitis, and central areas of hyper-attenuation