Nonallergic rhinitis with eosinophilia syndrome and related disorders.

NARES is a clinical syndrome consisting of symptoms consistent with AR in which an absence of atopy has been demonstrated by allergen skin testing, with nasal cytology analysis showing greater than 20% eosinophils. Anosmia is a prominent feature not shared with AR. The pathophysiology of NARES is poorly understood, but a key component involves a self-perpetuating, chronic eosinophilic nasal inflammation with development of nasal micropolyposis …