Allergic Fungal Sinusitis Diagnosis and Management
Summary
Allergic fungal sinusitis is a distinct form of chronic rhinosinusitis characterised by a non-invasive hypersensitivity reaction to fungal elements within the paranasal sinuses. It predominantly affects atopic, immunocompetent individuals and often presents with nasal obstruction, facial pressure, and diminished olfaction despite extensive mucosal disease. Diagnosis rests on a combination of characteristic radiological features—high-attenuation sinus opacification, sinus expansion, bony remodelling—and histopathological identification of eosinophilic mucin containing non-invasive fungal hyphae. Elevated total and fungal-specific IgE levels and type 2 immune markers further support the diagnosis. Management centres on thorough surgical clearance of allergic mucin and polyps via endoscopic sinus surgery, followed by tailored medical therapy. Systemic and topical corticosteroids remain the mainstay for reducing inflammation and preventing recurrence. Adjunctive measures such as antifungal agents, leukotriene antagonists and immunotherapy have shown mixed results, while emerging targeted therapies offer new avenues for refractory cases. Despite advances, recurrence rates remain high, underscoring the need for early recognition, multidisciplinary care and ongoing evaluation of novel immunomodulatory treatments. Global epidemiology varies with climate, but the disease burden is significant across temperate and tropical regions, with wide implications for quality of life and health-care resource allocation.
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Allergic Fungal Sinusitis Diagnosis and Management publication trend
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Technical terms
Allergic fungal sinusitis: A non-invasive, type 2 hypersensitivity reaction in the paranasal sinuses characterised by eosinophilic mucin and fungal elements.
Eosinophilic mucin: Thick, tenacious mucus rich in eosinophils and Charcot-Leyden crystals, often containing disintegrating fungal hyphae.
Nasal polyps: Benign, edematous protrusions of sinonasal mucosa that impede drainage and airflow.
Functional endoscopic sinus surgery: Minimally invasive surgical technique using endoscopes to remove obstructive tissue and restore sinus ventilation.
Biologics: Targeted therapeutic agents, often monoclonal antibodies, designed to modulate specific immune pathways.
Dupilumab: A monoclonal antibody against the interleukin-4 receptor alpha chain, inhibiting IL-4 and IL-13 signalling in type 2 inflammation.
References
- Allergic Aspergillus Rhinosinusitis. Journal of Fungi (2016).
- Allergic Fungal Rhinosinusitis: The Role and Expectations of Biologics. The Journal of Allergy and Clinical Immunology In Practice (2022).
- Clinical, Radiological, and Histopathological Patterns of Allergic Fungal Sinusitis: A Single-Center Retrospective Study. Cureus (2020).
- Successful Use of Dupilumab as a Salvage Therapy for Recalcitrant Allergic Fungal Rhinosinusitis: A Case Report. Cureus (2022).
- Recurrence Pattern and Complication Rate of Allergic Fungal Sinusitis: A 10‐Year Tertiary Center Experience. International Journal of Otolaryngology (2020).
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