Quick revision of Chronic Rhinosinusitis Allergic rhinitis Non allergic rhinitis Vasomotor rhinitis Complications of CRS Fungal rhinosinusitis According to ENT textbook

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Quick Revision: Rhinology Topics

Sources: Cummings Otolaryngology Head & Neck Surgery | Scott-Brown's Otorhinolaryngology Head & Neck Surgery | K.J. Lee's Essential Otolaryngology

1. CHRONIC RHINOSINUSITIS (CRS)

Definition

Symptoms lasting >12 consecutive weeks without resolution. Symptom-based diagnosis alone is unreliable - >40% of symptom-based CRS patients have normal CT and endoscopy.

Classification

Type	Subtype	Pathophysiology
CRSwNP (with nasal polyps)	TH2-skewed	Eosinophilic, high IL-5 + ECP, edematous stroma, albumin deposition, pseudocyst formation
CRSsNP (without nasal polyps)	TH1-skewed	Fibrosis, BM thickening, goblet cell hyperplasia, mononuclear infiltration, high IFN-gamma

Diagnosis

Requires two cardinal symptoms (nasal blockage, discharge, facial pain/pressure, anosmia) plus objective evidence by:

Nasal endoscopy (polyps, mucopus, edema in middle meatus)
CT scan findings

CT Findings

Diffuse/polypoid mucosal thickening
Sinus opacification (acute secretions: 10-25 HU; chronic/desiccated: 30-60 HU)
Osteitis - bone thickening and sclerosis (chronic marker)
Intrasinus calcifications
OMU pattern (25%): ipsilateral maxillary + frontal + anterior ethmoid disease

Five CT Patterns (Babbel's Classification)

Infundibular (26%) - focal obstruction, maxillary disease
OMU pattern (25%) - middle meatus obstruction - ipsilateral maxillary + frontal + anterior ethmoid
Sphenoethmoidal recess (6%) - sphenoid/posterior ethmoid
Sinonasal polyposis (10%) - diffuse nasal + sinus polyps
Sporadic/unclassifiable - retention cysts, mucoceles

Management

Medical (first-line):

Topical intranasal corticosteroids + saline irrigation (minimum 4 weeks before ENT referral)
Short course oral steroids for polyps
Antibiotics for acute exacerbations
Biologics (dupilumab, mepolizumab) for refractory CRSwNP

Surgical (FESS/ESS):

Indicated when medical therapy fails
CRSsNP: relieve OMC obstruction, restore mucociliary function
CRSwNP: polyp removal + wide passages for topical drug delivery (critical: thorough ethmoidectomy)
Surgery is adjunctive, not curative - ongoing medical therapy still required
Recent UK studies show delay in surgery adversely impacts sinonasal outcomes and asthma prevalence

2. ALLERGIC RHINITIS (AR)

Pathophysiology - Two Phases

Sensitization phase:

Allergen → APCs (macrophages, dendritic cells, Langerhans cells) engulf antigen
TSLP from epithelium → TH2-promoting dendritic cells
TH0 → TH2 differentiation (CD28 + CD80/CD86 + IL-4)
TH2 cells secrete IL-4, IL-5, IL-13 → IgE production
IgE attaches to high-affinity receptors on mast cells and basophils

Clinical disease phase:

Early response (mins): IgE cross-linking → mast cell degranulation → histamine, tryptase, PGD2, LTC4, LTB4, kinins → sneezing, pruritus, rhinorrhea, congestion
Late response (4-8 hrs): inflammatory cell recruitment (eosinophils, basophils, T-cells) → chronic nasal hyperreactivity

Classification

Seasonal (SAR) - pollens, molds
Perennial (PAR) - dust mites, cockroach, pet dander
Episodic/Intermittent vs Persistent
Local Allergic Rhinitis (LAR) - negative skin test/RAST but positive nasal allergen challenge

Clinical Features

Sneezing, watery rhinorrhea, nasal congestion, nasal/ocular pruritus
"Allergic salute" - supratip crease from pushing nose upward
Pale, bluish, edematous inferior turbinates with clear secretions
Adenoid facies (mouth breathing, high arched palate)

Diagnosis

Skin prick test (SPT) - preferred
Serum-specific IgE (RAST/ImmunoCAP)
Nasal smear - eosinophilia

Treatment

Allergen avoidance
Antihistamines (oral 2nd gen: loratadine, cetirizine, fexofenadine; intranasal: azelastine)
Intranasal corticosteroids - most effective for all symptoms
Leukotriene receptor antagonists (montelukast)
Allergen immunotherapy (AIT) - subcutaneous or sublingual - only disease-modifying treatment
Biologics (omalizumab for severe/comorbid asthma)
Decongestants - short-term only

3. NON-ALLERGIC RHINITIS (NAR)

Definition

Chronic nasal symptoms (congestion, rhinorrhea, postnasal drip) without immunologic, infectious, or structural cause. Distinguished from AR by:

Consistent/perennial symptoms (not seasonal)
Absence of nasal/ocular pruritus
Negative allergy testing

Types

Type	Key Features
Vasomotor (NAR/idiopathic)	Most common type; autonomic imbalance (parasympathetic predominance); triggers: cold air, odors, temperature changes, smoke; female predominance 2:1-3:1; diagnosis of exclusion
NARES	Non-allergic rhinitis with eosinophilia syndrome; >10-20% eosinophils on nasal smear; negative IgE; associated with aspirin-exacerbated respiratory disease
Drug-induced	NSAIDs/aspirin (local); alpha/beta blockers, ACE inhibitors, PDE5 inhibitors (neurogenic); psychotropics, hormones (idiopathic)
Rhinitis medicamentosa	Tachyphylaxis from nasal sympathomimetics; alpha-receptor desensitization; rebound congestion; limit decongestant use to 3 days
Hormonal	Pregnancy (22% incidence, peaks 2nd trimester), hypothyroidism, acromegaly, puberty; estrogens → vascular engorgement
Occupational	IgE-mediated and non-IgE irritant mechanisms; frequently associated with occupational asthma
Gustatory	Watery rhinorrhea after eating spicy/hot food; vagally mediated; treat with pre-prandial ipratropium
Atrophic (Ozena)	Klebsiella ozaenae; foul smell, green/yellow crusting, anosmia; squamous metaplasia, glandular atrophy, endarteritis obliterans

4. VASOMOTOR RHINITIS (VMR)

Definition

= Nonallergic rhinopathy (NAR) - most common type of non-allergic rhinitis; heterogeneous group with chronic nasal symptoms that are not immunologic, infectious, or associated with nasal eosinophilia.

Pathophysiology

Postulated imbalance in autonomic nervous system where parasympathetic predominance leads to:

Vasodilation
Mucosal edema
Hypersecretion

Triggers

Changes in climate (temperature, humidity, barometric pressure)
Strong odors (perfume, cooking, chemicals, flowers)
Environmental tobacco smoke
Pollutants
Exercise
Alcohol ingestion

Demographics

Primarily adults
Female predominance 2:1 to 3:1

Diagnosis

Diagnosis of exclusion - negative allergy testing, no eosinophilia, no identifiable cause

Treatment

Intranasal ipratropium bromide (anticholinergic - reduces rhinorrhea)
Intranasal corticosteroids (for congestion)
Nasal saline irrigation
Avoiding triggers
Capsaicin nasal spray (desensitizes C-fiber nociceptors)

5. COMPLICATIONS OF CRS (RHINOSINUSITIS)

Chandler's Classification for Orbital Complications

Stage	Type	Features
1	Preseptal (periorbital) cellulitis	Eyelid swelling; most common (50%); infection confined to preseptal tissues
2	Postseptal (orbital) cellulitis	Extension through orbital septum; chemosis, proptosis, possible diplopia
3	Subperiosteal abscess	Pus between periorbita and orbital wall; 15% of orbital complications
4	Orbital abscess	<1%; intraconal pus; severe proptosis, ophthalmoplegia
5	Cavernous sinus thrombosis	Septic thrombophlebitis of superior ophthalmic vein; bilateral signs; mortality 14-79%

Full Classification of Complications

Orbital (most common overall):

Preseptal cellulitis (50%), postseptal cellulitis (35%), subperiosteal abscess (15%), orbital abscess (<1%), cavernous sinus thrombosis

Intracranial:

Subdural empyema (38%)
Intracranial (cerebral) abscess (30%)
Extradural abscess (23%)
Meningitis (2%)
Cavernous/sagittal sinus thrombosis (2%)

Bony:

Osteomyelitis
Pott's puffy tumor - osteomyelitis of frontal bone with subperiosteal abscess; presents as fluctuant swelling over forehead

Chronic:

Mucocele - epithelial-lined, mucus-filled expansion of sinus; most common in frontal and ethmoid sinuses; causes bony erosion; can lead to orbital/intracranial complications; treatment: endoscopic marsupialization
Pyocele - infected mucocele

Monitoring for Orbital Complications

Regular assessment of: chemosis, eye movements (diplopia), proptosis, relative afferent pupillary defect (RAPD), visual acuity (Snellen), colour vision (Ishihara), optic disc
4-6 hourly monitoring if worsening
CT (with contrast) - first-line imaging
MRI - superior soft tissue detail; added for intracranial extension

6. FUNGAL RHINOSINUSITIS (FRS)

Classification - Two Main Groups

Fungal Rhinosinusitis
├── NONINVASIVE
│   ├── Fungus Ball (Mycetoma)
│   └── Allergic Fungal Rhinosinusitis (AFRS)
└── INVASIVE
    ├── Acute Invasive FRS
    └── Chronic Granulomatous Invasive FRS

A. Fungus Ball (Mycetoma)

Single sinus (usually maxillary)
Normal immune host
CT: speckled/chunky calcifications in opacified sinus
MRI: hypointense on T1 and T2 (absence of free water)
Treatment: ESS - large antrostomy + irrigation/removal of debris; no further medical therapy usually needed

B. Allergic Fungal Rhinosinusitis (AFRS)

Type I hypersensitivity reaction to fungal antigens (not invasive)
Common organisms: Bipolaris, Curvularia, Alternaria (dematiaceous fungi); Aspergillus
Typically atopic patients with history of asthma

Bent and Kuhn Diagnostic Criteria (1994):

MAJOR (ALL required)	MINOR (supportive)
Type I hypersensitivity (skin test/IgE)	Asthma
Nasal polyposis	Unilateral disease predominance
Characteristic CT findings (soft tissue heterodensity)	Bone erosion
Eosinophilic mucin without fungal tissue invasion	Positive fungal cultures
Positive fungal stain of surgical contents	Charcot-Leyden crystals
	Serum eosinophilia

CT/MRI hallmarks:

CT: hyperdense (soft tissue differential densities within sinuses) with surrounding hypodense mucoid material
MRI: low T1 signal + signal void on T2 (paramagnetic metals - iron, manganese)
Multiple bilateral sinus involvement; may cause bone erosion + orbital/skull base expansion

Treatment:

ESS (primary) - removes polyps and eosinophilic mucin
Oral corticosteroids - mainstay post-op medical therapy
Immunotherapy - emerging role
Antifungals (limited role currently)

C. Acute Invasive FRS (AIFRS)

Surgical emergency - angioinvasive infection
Setting: severely immunocompromised (hematologic malignancy, bone marrow transplant, neutropenia, uncontrolled DM/DKA, AIDS)
Mortality: 40-80%
Organisms: Aspergillus (septate hyphae, 45-degree branching) and Zygomycetes/Mucor (non-septate ribbon-like hyphae, irregular branching)

Clinical features: fever, facial swelling, nasal congestion, ophthalmoplegia, proptosis, vision loss

Diagnosis: endoscopy + biopsy showing mucosal pallor/necrosis/crusting on middle turbinate → frozen section showing necrosis + fungal forms + angioinvasion

Stains: Calcofluor-white, Grocott methenamine silver (GMS)

CT: Non-specific initially; bony erosion is a late sign; MRI superior - loss of contrast enhancement in devitalized mucosa

Treatment (triad):

Antifungal therapy - liposomal amphotericin B (associated with improved survival)
Surgical debridement - serial debridements every 2-3 days until healthy bleeding tissue
Reversal of immunocompromise - most critical factor for survival

D. Chronic Invasive FRS

Slowly progressive; mildly immunocompromised (e.g., diabetics)
Granulomatous and non-granulomatous subtypes
Can be lethal; surgical management similar to acute FRS

Key Distinguishing Points (EXAM TABLE)

Feature	Fungus Ball	AFRS	Acute Invasive
Immunity	Normal	Atopic/normal	Severely immunocompromised
Invasion	No	No	YES - angioinvasive
Polyps	No	Yes (bilateral)	No
CT	Single sinus, calcification	Multi-sinus, heterodense	Non-specific → bone erosion
IgE	Normal	Elevated (Type I)	Not relevant
Treatment	ESS alone	ESS + steroids + immunotherapy	ESS + AmB + reverse immunocompromise

Sources: Cummings Otolaryngology Head and Neck Surgery, Scott-Brown's Otorhinolaryngology Head & Neck Surgery (Vol 1 & 2), K.J. Lee's Essential Otolaryngology

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