Fungal rhinosinusitis (FRS) comprises a spectrum of disease processes that vary in clinical presentation, histologic appearances, and biological significance. FRS can be acute or chronic and is most commonly classified as non-invasive or invasive based on whether fungi have invaded into tissue. This manuscript will review the pathologic classification of FRS.
Keywords: Acute invasive fungal rhinosinusitis; Allergic fungal rhinosinusitis; Allergic mucin; Aspergillus; Fungal ball; Rhinosinusitis.