MANAGEMENT OF LARYNGOTRACHEAL STENOSIS

50-Mark Answer | RGUHS ENT Examination

INTRODUCTION

AETIOLOGY

CLASSIFICATION

Myer-Cotton Grading System (most widely used)

• McCaffrey (tracheal stenosis) - 4 stages based on length and location
• Bogdasarian (posterior glottic stenosis) - Types I-IV based on scar extent
• Cotton Staging (for LTR planning) - Stages 1-3 based on tracheostomy dependence

DIAGNOSIS

• Flexible fiberoptic laryngoscopy - vocal fold mobility, dynamic airway assessment
• Microlaryngoscopy and Bronchoscopy (MLB) - Gold standard; stages severity, measures dimensions
• CT neck + chest - defines anatomy, cartilage integrity, multilevel disease
• Spirometry/Flow-volume loop - Fixed stenosis: flat top both inspiration and expiration; variable extrathoracic: limits inspiration; variable intrathoracic: limits expiration
• FEES/Videofluoroscopy - mandatory if swallowing impairment suspected (poor outcomes post-reconstruction if even minor aspiration present)
• Antireflux evaluation (LPR is a risk factor)

MANAGEMENT FLOWCHART (Cummings, Fig. 209.7)

DECISION-MAKING FRAMEWORK

┌──────────────────────────────────────────────────────────────┐
│              LARYNGOTRACHEAL STENOSIS                        │
│   History → MLB → CT → Spirometry → FEES → MDT review      │
└────────────────────────┬─────────────────────────────────────┘
                         │
    ┌────────────────────┼────────────────────┐
    │                    │                    │
SYSTEMIC DISEASE     GRADE I-II          GRADE III-IV
(GPA, TB, sarcoid)   SOFT STENOSIS       HARD FIBROTIC
    │                    │                    │
TREAT CAUSE          ENDOSCOPIC           CARTILAGE
FIRST                MANAGEMENT           INTACT?
    │                    │               /         \
    ↓                    ↓              YES          NO
After control:       Laser + Balloon    │             │
consider             ± MMC ± Steroid  ENDOSCOPIC  OPEN SURGERY
endoscopic/open      Repeat every     TRIAL        DIRECTLY
                     3-4 weeks        │
                         │         Fails after
                      Success?      3 sessions?
                     /       \           │
                   Yes        No       OPEN SURGERY
                    │          │
                 Follow      ┌─┴───────────────────┐
                  up         │                     │
                          ADULT               PEDIATRIC
                             │                     │
                     ┌───────┤               ┌─────┤
                     │       │               │     │
                   CTR   Tracheal          SSLTR DSLTR
                (preferred) Resection    ± ant/post rib graft

MANAGEMENT IN DETAIL

I. CONSERVATIVE / MEDICAL MANAGEMENT

• Observation: Grade I SGS; children with mild SGS (airway grows with age)
• Treat underlying cause: GPA → cyclophosphamide + steroids/rituximab; TB → ATT; sarcoid → systemic steroids
• Antireflux therapy: PPI twice daily + alginate suspension (routine perioperative)
• Systemic steroids: Adjunct in inflammatory phase
• Racemic epinephrine nebulization: Acute mucosal edema reduction
• Inhaled corticosteroids: Early mild stenosis

II. ENDOSCOPIC MANAGEMENT

A. Balloon Dilation

• Applies uniform radial pressure (unlike rigid dilators which apply shearing force)
• High-pressure airway balloons; sized to age
• Combined with radial incisions for best results
• Effective for short, thin, web-like stenoses

B. CO2 Laser Excision

• Radial cuts at 12, 3, and 9 o'clock positions
• Preserves posterior commissure to prevent re-stenosis
• Fiber-based systems (thulium CO2) for improved accuracy and access
• Useful for early granulation tissue stenosis
• NOT repeated if no improvement (worsens injury)

C. Intralesional Corticosteroid

• Triamcinolone acetonide (Depo-Medrone 40 mg/mL, up to 3 mL)
• Injected before or after dilation
• Common in practice despite controversial evidence

D. Topical Mitomycin-C (MMC)

• Alkylating agent → inhibits fibroblast proliferation and scar reformation
• Applied via pledgets (0.4 mg/mL for ~4 minutes) after dilation/scar lysis
• Best on young granulation tissue; less effective on mature scar
• Risk: fibrinous exudate causing acute airway obstruction
• Cummings, p. 1875-1878

E. Endoscopic Stents

• T-tubes (Montgomery), silicone stents as temporary/palliative
• Metal stents (SEMS) only for malignant stenosis
• Risks: mucosal ischemia, granulation, infection

III. OPEN SURGICAL MANAGEMENT

A. Anterior Cricoid Split (ACS)

• Indication: Neonates/infants failing extubation
• Midline division of cricoid + upper tracheal rings anteriorly
• Patient intubated post-op; extubated after 5-7 days in ICU
• Augmented with auricular/thyroid cartilage graft if needed
• Contraindicated in ventilator-dependent patients
• Success rate: 35-88%

B. Laryngotracheal Reconstruction (LTR) - Gold standard for pediatric SGS

• Rib cartilage (6th/7th rib) - most common; shaped as a boat/keel graft
• Auricular conchal cartilage (smaller defects)
• Thyroid cartilage (pedicled, vascularized)
• Nasal septal cartilage

• Anterior LTR: anterior cricoid split + anterior graft (for anterior and circumferential stenosis)
• Posterior LTR: posterior cricoid split + posterior graft (for posterior glottic stenosis)
• Combined: both grafts for severe circumferential stenosis
• Decannulation rates: 85-95%

C. Cricotracheal Resection (CTR) - Preferred in ADULTS

• Resects anterior cricoid lamina + stenotic segment
• Thyrotracheal anastomosis to residual posterior cricoid shell
• Advantages over LTR: no donor site morbidity, better voice outcomes, no glottic surgery, near-normal mucosalized airway
• Maximum resection: 4-6 cm in adults (with release procedures)
• Success rate: 90-95%

1. Collar incision; cricothyroid muscle dissected and reflected (protecting RLN)
2. Superior cut: inferior thyroid cartilage → below cricothyroid joints
3. Inferior cut: one ring below first normal tracheal ring
4. Anterior pedicled wedge of cricoid preserved for lumen enlargement
5. Thyrotracheal anastomosis; suprahyoid release for tension relief
6. Chin-to-chest sutures (7-10 days); stent (ETT, T-tube, or suprastomal)
7. Return to OR at day 7-10 for inspection

D. Tracheal Resection and Primary Anastomosis

• For isolated tracheal stenosis (post-intubation, post-tracheostomy)
• Release procedures to reduce anastomotic tension:
  • Suprahyoid laryngeal release
  • Pulmonary hilar release
  • Cervical flexion sutures (chin to chest)

E. Tracheostomy

• Permanent palliation; bridge to definitive surgery; emergency airway

IV. MANAGEMENT BY STENOSIS TYPE

RECENT ADVANCES (2021-2026)

1. Endoscopic management expansion to severe (Grade III) stenosis with lower morbidity - [Pinzas et al., Thorac Surg Clin 2025, PMID: 39515893]
2. Fiber-based lasers (thulium, CO2 fiber): improved precision and access to difficult anatomical sites
3. Bioresorbable stents (PGLA-based): experimental; avoids repeat endoscopy for stent removal
4. Tracheal allotransplantation with immunosuppression: for long-segment disease
5. Tissue engineering/bioengineered trachea: decellularized scaffolds seeded with autologous stem cells (clinical trials ongoing)
6. Idiopathic SGS - hormonal research: estrogen/progesterone roles being studied; GLP-1 agonists as anti-fibrotics
7. TORS (Transoral Robotic Surgery): for posterior glottic and supraglottic lesions
8. 3D virtual bronchoscopy + dynamic CT: for preoperative planning and surveillance
9. Comprehensive imaging protocols for functional airway assessment - [Romero-Sanchez et al., Radiographics 2025, PMID: 40638414]
10. Single-stage CTR in pediatrics: extending adult CTR success to children with favorable anatomy - [Smith & Buck, Expert Rev Respir Med 2022, PMID: 36347385]
11. Updated classification systems: incorporating CT, endoscopic, and functional parameters - [Zhao et al., MedComm 2025, PMID: 39866837]

COMPLICATIONS

KEY PEARLS FOR RGUHS EXAM

• The best chance for successful repair lies in the initial operation - so correct case selection is paramount
• Resistance is proportional to 1/r⁴ - doubling radius reduces resistance 16-fold
• Endoscopy fails if: cartilage damage, length >3 cm, obesity, aspiration - proceed to open surgery
• CTR preferred over LTR in adults (no donor site morbidity, better voice outcomes, higher success)
• Maximum tracheal/laryngeal resection in adults: 4-6 cm with release procedures
• Rule of 3 endoscopies: convert to open if no improvement by 3rd procedure
• MMC: best on young scars, not effective on mature fibrosis
• Idiopathic SGS = middle-aged women, high recurrence after endoscopy → CTR is curative
• FEES/swallow assessment is mandatory before any reconstruction (aspiration = poor outcome)
• Systemic disease (GPA, TB) must be treated before surgical reconstruction

• Scott-Brown's Otorhinolaryngology HNS (8th ed.) Chapter 76
• Cummings Otolaryngology HNS (7th ed.) Chapters 67 and 209
• KJ Lee's Essential Otolaryngology
• Dhingra's Diseases of Ear, Nose & Throat
• Hazarika's ENT and HNS (Clinical methods and operative)
• Stell & Maran's Operative Head & Neck Surgery
• Zakir Hussain's Operative ENT