Allergic Fungal Rhinosinusitis (AFRS)
AFRS is a distinct rhinosinusitis phenotype characterised by Type I hypersensitivity to ubiquitous fungi such as Aspergillus, Bipolaris and Curvularia, defined by Bent-Kuhn criteria including total IgE >1000 IU/mL and eosinophilic mucin with scattered fungal hyphae.
Within general ENT, Allergic Fungal Rhinosinusitis (AFRS) is more useful as clinical context than as a single report word. AFRS is a distinct rhinosinusitis phenotype characterised by Type I hypersensitivity to ubiquitous fungi such as Aspergillus, Bipolaris and Curvularia, defined by Bent-Kuhn criteria including total IgE >1000 IU/mL and eosinophilic mucin with scattered fungal hyphae. Patient history, objective findings, risk profile and functional loss improve decision quality when reviewed together. the finding assessment brings nasal-sinus symptoms, this entry throat-tonsil context, the clinical point upper-airway impact and the dictionary entry sleep links into one ENT frame. The entry makes this topic safety limits, examination priorities and follow-up logic easier to understand. A clinical view of this term interprets anatomical or symptom definitions together with daily-life impact: Bent-Kuhn criteria (all 5 required): Type I hypersensitivity, nasal polyposis, characteristic CT findings, eosinophilic mucin without fungal invasion, and positive fungal stain/culture. This keeps repeat testing burden and delayed diagnosis risk in the same frame.
The diagnostic pathway for the finding uses history, examination and selected testing as complementary steps. If patient-reported change and clinical findings point in different directions, assessment is widened. this entry review may combine ENT examination, this entry endoscopic assessment, the clinical point oral cavity-oropharynx inspection and the dictionary entry audiological testing when useful. this topic decisions record fever, this term pain-bleeding pattern, the finding hearing or nasal blockage, this entry sleep impact and the clinical point infection recurrence separately. The examination plan for the dictionary entry is built around duration, side, progression and associated risks rather than one symptom alone: CT demonstrates hyperdense inspissated mucin (denser than brain parenchyma) with expansive bone remodelling of the sinus walls. Previous reports can therefore improve decision quality. The decision stays safe while avoiding unnecessary investigation burden.
The treatment plan for this topic depends on what the finding represents in that patient. Observation, lifestyle adjustment, medication, voice hygiene, allergy control, infection treatment, rehabilitation, endoscopic procedures and the clinical point surgery are compared within the same decision tree. the dictionary entry planning discusses medical treatment, this topic allergy control, this term endoscopic procedures, the finding adenoid-tonsil strategy or this entry airway surgery by indication. Management of the clinical point aims to improve quality of life while protecting breathing, the dictionary entry safety, hearing, swallowing and oncologic risk separately. The goal is a measured pathway that protects safety and function.
After this topic, review does not only ask whether the symptom improved; examination findings, functional gain and safety boundaries are compared as well. this term follow-up compares pain, the dictionary entry nasal openness, this topic sleep quality, this term hearing impact and the finding infection recurrence over time. For this entry, patients learn which findings can be expected and which changes are linked to reassessment. If the clinical point recovery changes with the dictionary entry context with high fever, breathing difficulty, bleeding or one-sided progression, reassessment is prioritized.
Online reading about this topic should organize clinical questions rather than decide care; previous tests and treatment responses are easier to use when prepared in chronological order.
Diagnosis
All Bent-Kuhn criteria must be satisfied. CT shows hyperdense inspissated mucin (denser than brain) and bone expansion (not erosion). MRI provides additional information with T1 and T2 hypointense signal (dense protein/mineral content). Total IgE >1000 IU/mL is expected; specific fungal IgE (skin test or RAST) helps identify the sensitising agent. Tissue biopsy may reveal Charcot-Leyden crystals and fungal hyphae.
Treatment
Surgical FESS with complete removal of inspissated mucin is the cornerstone of treatment. Postoperative topical antifungal irrigation and systemic steroid taper (prednisolone 0.5 mg/kg for 2–4 weeks) are administered. Long-term intranasal corticosteroid is mandatory. Allergen immunotherapy targeting fungal allergens is being evaluated as adjunctive therapy to reduce recurrence. Omalizumab shows promising results in IgE-mediated cases.
Outcomes and Follow-up
Recurrence reaches 60–80% at 10 years post-surgery, the highest rate among all CRS phenotypes. Regular nasal endoscopy surveillance every 3–6 months is mandatory. Evidence for the role of omalizumab and other biologics in long-term recurrence control is accumulating. Orbital or skull-base expansion warrants urgent surgical evaluation.
When to Seek Care
Unilateral facial swelling or expansion, proptosis, visual change or diplopia requires urgent surgical evaluation. When total IgE >1000 IU/mL is found alongside bilateral polyposis, specialist referral for CT and allergy evaluation should be planned considering the possibility of AFRS.
Frequently asked questions
What is Allergic Fungal Rhinosinusitis (AFRS)?
When is Allergic Fungal Rhinosinusitis (AFRS) clinically important?
When is ENT assessment relevant for Allergic Fungal Rhinosinusitis (AFRS)?
What information helps assessment of Allergic Fungal Rhinosinusitis (AFRS)?
Learn more about this procedure
Detailed guide from Prof. Dr. Özdoğan's clinic
References
This glossary entry is for informational purposes only and does not constitute medical advice. Consult a qualified specialist for diagnosis and treatment.