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Local Allergic Rhinitis (Entopy)

Localized nasal IgE-mediated hypersensitivity with positive nasal allergen provocation despite negative skin prick tests and serum IgE, requiring specialized diagnosis and allergen-targeted therapy.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

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This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our KBB (Kulak Burun Boğaz) department. Book Appointment →

What is Local Allergic Rhinitis (Entopy)?

LAR is characterized by local nasal IgE production (entopy) in patients without systemic sensitization. Allergens drive Th2 responses in nasal mucosa, causing local IgE class switching, mast cell activation, and symptom production identical to classic allergic rhinitis, but skin prick tests and serum IgE remain negative.

Pathophysiology involves nasal-restricted germinal center-like reactions with somatic hypermutation, IgE class switching, and B-cell maturation locally. Allergen triggers include house dust mite (most common), grass pollens, olive pollen, Alternaria, and animal dander.

LAR was characterized by Spanish allergy groups (Rondón, Campo) showing prevalence of 25-50% in 'non-allergic rhinitis' patients in specialty clinics. Clinical course often progresses with worsening symptoms, asthma development, and possibly eventual systemic sensitization in 25% over 5-10 years.

Symptoms

Sneezing, nasal itching, watery rhinorrhea (classic allergic symptoms)
Nasal congestion with seasonal or perennial pattern
Conjunctival itching and watering (less common than systemic AR)
Postnasal drip, throat clearing
Symptoms worsen with specific exposures (dust, pollen, animal dander)
Negative skin prick test and serum specific IgE (paradoxical)
Often labeled as 'non-allergic rhinitis' or 'idiopathic rhinitis' before specialized testing

Risk Factors

Family history of atopy (allergic rhinitis, asthma, eczema)
Female predominance (60-70%)
Adult-onset symptoms (mean age 25-45 years)
House dust mite exposure (most common allergen)
Co-existing asthma (asthma develops in 20-30% over follow-up)
Pollution exposure may exacerbate disease
Geographic prevalence variation (Mediterranean countries higher)

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Persistent rhinitis symptoms with negative skin prick test and serum IgE
  • Symptoms with specific exposure pattern (seasonal, dust-related, pet-related)
  • Failure of standard non-allergic rhinitis management
  • Allergy and immunology consultation for nasal provocation testing
  • Consideration of allergen immunotherapy

Treatment Methods

01
Diagnostic confirmation: nasal allergen provocation test (NAPT) is gold standard. Specific allergen sprayed/dropped into nostril, symptoms scored (TNSS), peak nasal flow measured before and after; positive result = ≥30% reduction in peak flow or significant symptom increase
02
Adjunctive diagnosis: nasal lavage IgE measurement (basophil/mast cell tryptase), nasal cytology (eosinophils on smear), basophil activation test (CD63 expression with allergen)
03
First-line pharmacotherapy: intranasal corticosteroids (mometasone, fluticasone, budesonide) — same efficacy as systemic AR; oral or intranasal antihistamines (cetirizine, loratadine, azelastine)
04
Combination therapy: intranasal corticosteroid + intranasal antihistamine (azelastine-fluticasone fixed combination) — superior to monotherapy
05
Allergen immunotherapy: subcutaneous (SCIT) or sublingual (SLIT) immunotherapy with implicated allergen — documented efficacy in LAR (Rondón et al.); mechanism: induces tolerance, reduces local IgE, prevents progression
06
Allergen avoidance: dust mite covers, HEPA filters, animal dander control, pollen monitoring
07
Treatment of comorbidities: associated asthma (intranasal-pulmonary axis), conjunctivitis (topical antihistamine drops, mast cell stabilizers), sleep-disordered breathing
08
Long-term follow-up: monitor for systemic sensitization development (annual skin testing), asthma progression, treatment response
09
Surgical considerations: turbinate reduction, septoplasty for refractory congestion when anatomical contributions present
10
Refractory disease: oral corticosteroid courses, biologic therapies (omalizumab in selected cases) — emerging evidence
11
Patient education: explain entopy concept, importance of NAPT for accurate diagnosis, role of immunotherapy, prognosis

Which Department to Visit?

You can visit our KBB (Kulak Burun Boğaz) department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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