Allergic fungal rhinosinusitis

Area of Science:

• Immunology
• Otolaryngology
• Allergy

Background:

• Allergic fungal rhinosinusitis (AFRS) is a specific type of chronic rhinosinusitis with nasal polyps (CRSwNP).
• It is defined by IgE sensitivity to fungi, eosinophilic allergic mucin, and distinct sinus imaging findings.
• AFRS occurs in immunocompetent individuals, influenced by environmental and host factors.

Purpose of the Study:

• To delineate the molecular pathways and immune responses underlying AFRS.
• To investigate if AFRS represents an extreme form of CRSwNP pathways or a distinct endotype.
• To review current treatment strategies and identify areas for future research.

Main Methods:

• Review of existing literature on AFRS pathophysiology and immune mechanisms.
• Comparison of immune responses in AFRS with other CRSwNP and allergic conditions.
• Analysis of current treatment modalities, including surgical and pharmacological interventions.

Main Results:

• AFRS involves adaptive and innate type 2 immune responses, similar to CRSwNP.
• The precise immune endotype of AFRS remains to be fully elucidated.
• Surgical debridement is the primary treatment; oral corticosteroids help prevent recurrence.

Conclusions:

• AFRS shares immune pathways with CRSwNP, but distinct endotypes may exist.
• Adjunctive therapies like antifungals lack strong evidence; biologics targeting type 2 inflammation warrant investigation.
• Further research is needed to confirm the efficacy of biologic agents in AFRS patients.