Teach me about voice disorder in simple from.ent
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I now have rich content from multiple ENT textbooks. Let me compile a comprehensive, simple-language guide on voice disorders.
Voice Disorders - A Simple ENT Guide
What Is a Voice Disorder?
A voice disorder (also called dysphonia) is any change in voice quality, pitch, loudness, or the effort needed to speak. The most familiar symptom is hoarseness - a rough, raspy, or strained sound. The symptom of hoarseness almost always points to the larynx (voice box) as the site of the problem.
- Goldman-Cecil Medicine defines it as: "altered voice quality, pitch, loudness, or vocal effort."
How the Voice Is Normally Produced
Understanding voice disorders is easier if you know how voice is made:
- Lungs - provide the airstream (the "fuel")
- Vocal folds (vocal cords) - two mucous membrane folds in the larynx that vibrate when air passes between them
- Resonators - the throat, mouth, and nose shape the sound into speech
When air from the lungs rushes past the nearly-closed vocal folds, a pressure drop (the Bernoulli effect) pulls them together. They snap open and shut hundreds of times per second, creating sound. Any disease that disrupts this vibration causes a voice disorder.
- Cummings Otolaryngology describes this as: the lungs supply the essential energy, the diaphragm controls air release, and the myoelastic properties of the vocal fold cover govern the opening/closing cycle that produces sound.
Main Categories of Voice Disorders
1. Inflammatory / Infectious
Acute Laryngitis
- Most common cause of sudden hoarseness
- Usually caused by a viral upper respiratory infection (common cold)
- The vocal folds swell and cannot vibrate properly
- Treatment: voice rest, hydration, humidification, avoid smoking/irritants. Antibiotics are NOT recommended unless bacteria are confirmed. Corticosteroids can help in severe cases.
- Usually resolves within days.
Fungal Laryngitis
- Caused mainly by Candida albicans
- Seen in patients who are immunocompromised or using inhaled steroids
- White patches on a reddened larynx
- Treatment: topical (nystatin, clotrimazole) or systemic (fluconazole) antifungals
Reflux Laryngitis (LPR - Laryngopharyngeal Reflux)
- Stomach acid rises up and irritates the larynx
- Causes hoarseness, throat clearing, globus sensation (lump in throat), increased mucus
- Can lead to vocal cord nodules, polyps, and granulomas over time
- Treatment: Proton pump inhibitors (PPIs) twice daily initially; lifestyle changes
2. Benign Structural Lesions
These are the most common causes of chronic hoarseness.
| Lesion | Who Gets It | Key Feature | Treatment |
|---|---|---|---|
| Vocal Nodules ("screamer's nodules") | Singers, teachers, children who yell | Bilateral, at junction of anterior 1/3 and posterior 2/3 of cord | Voice therapy first; surgery if persistent |
| Vocal Polyp | Adults; linked to smoking, voice overuse, allergy | Usually unilateral, soft, fluid-filled | Surgical removal + voice therapy |
| Vocal Granuloma | Post-intubation or GERD | Posterior cord, at vocal process of arytenoid | Treat underlying cause (acid, voice rest) |
| Vocal Cord Cyst | Any age | Fluid-filled sac under mucosa | Surgical excision |
| Papillomas (RRP) | Children & adults; HPV 6 & 11 | Warty growths, recurrent | Laser/surgical removal, repeat treatment |
| Leukoplakia | Smokers | White patch; premalignant - must biopsy | Stop smoking; close surveillance |
3. Vocal Fold Paralysis
The vocal folds are moved by the recurrent laryngeal nerve (RLN), a branch of the vagus nerve (CN X). Damage to this nerve causes paralysis.
Causes:
- Thyroid surgery, neck/chest surgery (most common surgical cause)
- Thoracic tumors (mediastinal masses) compressing the left RLN
- Aortic aneurysm
- Viral/idiopathic (like Bell's palsy, but for the larynx)
- Neck trauma, intubation
Unilateral paralysis:
- Breathy, weak voice; possible aspiration (food/liquid going into airway)
- The other cord tries to compensate
- Treatment: Temporary - injection medialization (collagen/fat injection); Permanent - thyroplasty (surgical medialization)
Bilateral paralysis:
- Airway obstruction is the main danger
- Voice may be near-normal but breathing is severely compromised
- May require tracheotomy
4. Functional / Psychogenic Voice Disorders
- Voice loss (aphonia) or strain without any structural lesion
- Often linked to stress, anxiety, or psychological trauma
- Diagnosis of exclusion (laryngoscopy is normal)
- Treatment: voice therapy with a speech-language pathologist; psychological support
5. Malignant (Cancer)
- Squamous cell carcinoma of the larynx is the main concern
- Strongly associated with smoking and alcohol
- Hoarseness is often the FIRST symptom in glottic (cord) cancer - which is actually good, as it allows early detection
- HPV-related oropharyngeal carcinoma is rising in non-smokers
- Rule: Any hoarseness lasting more than 4 weeks must be referred to an ENT for laryngoscopy to exclude cancer
6. Neurological / Systemic Voice Disorders
- Spasmodic dysphonia - involuntary spasms of the laryngeal muscles (strangled, strained voice)
- Parkinson's disease - soft, monotone voice (hypophonia)
- Myasthenia gravis - voice fatigues and worsens with use
- Multiple sclerosis - variable dysphonia
Key Red Flags - When to Worry
- Hoarseness lasting > 4 weeks - needs ENT review
- Blood in sputum (hemoptysis)
- Associated difficulty swallowing (dysphagia)
- Unexplained weight loss
- Ear pain (referred otalgia) from a throat lesion
- History of heavy smoking + hoarseness = suspect cancer until proven otherwise
- Associated stridor (noisy breathing) = urgent airway assessment
Diagnosis
| Tool | What It Shows |
|---|---|
| Laryngoscopy (flexible or rigid) | Direct view of vocal folds - gold standard |
| Videostroboscopy | Slow-motion view of cord vibration |
| Voice analysis (acoustic) | Measures pitch, perturbation, noise |
| CT/MRI neck & chest | Looks for masses compressing the RLN |
| Laryngeal EMG | Distinguishes paralysis from fixation |
Treatment Summary
| Cause | Treatment |
|---|---|
| Viral laryngitis | Voice rest, hydration, time |
| GERD laryngitis | PPIs, lifestyle changes |
| Vocal nodules | Voice therapy; surgery if needed |
| Vocal polyps/cysts | Surgery |
| Vocal fold paralysis | Injection/thyroplasty |
| Cancer | Surgery, radiotherapy, chemotherapy |
| Functional dysphonia | Speech therapy, psychological support |
| Spasmodic dysphonia | Botulinum toxin injection (most effective) |
Quick Memory Aid
SIMPLE causes of hoarseness:
- S - Smoking (cancer risk)
- I - Infection (laryngitis)
- M - Misuse/abuse (nodules)
- P - Paralysis (RLN damage)
- L - LPR / GERD reflux
- E - Everyday benign lesions (polyps, cysts)
Sources: Cummings Otolaryngology Head and Neck Surgery | Goldman-Cecil Medicine | Scott-Brown's Otorhinolaryngology Head & Neck Surgery | Textbook of Family Medicine, 9e
Teach me about carcinoma of larynx viva manner
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I now have comprehensive data from the best ENT and pathology textbooks. Let me compile the full viva-style guide.
Carcinoma of the Larynx - Viva Style
Q1. What is carcinoma of the larynx?
A malignant tumor arising from the epithelial lining of the larynx. It represents about 2% of all cancers and is the second most common malignancy of the upper aerodigestive tract.
- 95% are Squamous Cell Carcinoma (SCC)
- M:F ratio = 4:1 to 7:1
- Most common after age 40
Q2. What are the risk factors?
- Smoking - most important; 10-20x increased risk. Risk drops 60% after 10+ years cessation.
- Alcohol - synergistic with smoking
- HPV - types 6 & 11 (via recurrent respiratory papillomatosis - 3-7% undergo malignant change); types 16 & 18 under investigation
- Prior head and neck SCC (field cancerization)
- Occupational exposure - asbestos, wood dust, nickel, leather, diesel fumes
- GERD / laryngopharyngeal reflux
Q3. What are the sites? What is the most common site?
| Site | Frequency | Key Feature |
|---|---|---|
| Glottis (true vocal cords) | 59-75% - MOST COMMON | Presents EARLY with hoarseness |
| Supraglottis | 25-40% | Presents LATE; rich lymphatics; more nodal spread |
| Subglottis | <5% | RAREST; presents very late; worst prognosis |
Q4. Why does glottic cancer have a better prognosis than supraglottic?
Two reasons:
- Early symptoms - even a small glottic tumor causes hoarseness, so it is caught early
- Sparse lymphatics - the glottis has a poor lymphatic supply, so nodal metastasis is rare in early disease (T1/T2 <5%)
Supraglottis is rich in lymphatics → 25-50% have cervical nodes at presentation. Subglottic has the worst prognosis because it is silent until advanced.
Q5. What is the pre-malignant spectrum?
Hyperplasia → Atypia → Dysplasia (mild/moderate/severe) → Carcinoma in Situ (CIS) → Invasive carcinoma
- Mild dysplasia = abnormalities in basal 1/3 of epithelium
- Moderate dysplasia = up to 2/3 thickness
- Severe dysplasia = > 2/3 thickness (30% transform to cancer)
- CIS = full thickness atypia but no basement membrane invasion
- Time to malignant transformation: 3-10 years
Clinically, leukoplakia (white patch) on the vocal cord = must biopsy. It is not always cancer but is a red flag.
Q6. What does carcinoma of the larynx look like?
Gross: Pearly gray, wrinkled plaque that undergoes ulceration and can become fungating/exophytic as it grows.
Gross specimen: Supraglottic laryngeal squamous cell carcinoma - large exophytic mass visible inside the opened larynx (Robbins & Kumar Basic Pathology)
Histology:
- Well-differentiated: keratinization + intercellular bridges + pleomorphic nuclei
- Moderately differentiated: less keratinization
- Poorly differentiated: minimal keratinization, numerous atypical nuclei
- Adjacent mucosa may show dysplasia or CIS (field effect from carcinogens)
Q7. What are the symptoms?
| Symptom | Notes |
|---|---|
| Hoarseness | Most common and earliest symptom - especially in glottic tumors |
| Sore throat | Second most common |
| Referred otalgia | Ear pain via Arnold's nerve (vagal branch) - important red flag |
| Dyspnea / Stridor | Airway compromise - late sign |
| Dysphagia / Aspiration | Late feature; large supraglottic tumors |
| Hemoptysis | Blood in sputum |
| Globus sensation | Lump in throat |
| Weight loss | Advanced/systemic disease |
| Neck lump | Cervical lymph node metastasis |
Key viva point: Hoarseness > 4 weeks = always refer for laryngoscopy to rule out cancer.
Q8. What is the anatomy relevant to spread?
- Conus elasticus - fibroelastic membrane below the cords; limits lateral spread of glottic cancer
- Broyles' tendon - vocalis muscle inserts here on thyroid cartilage; area lacks perichondrium = potential route for cartilage invasion
- Paraglottic space - between the conus elasticus and quadrangular membrane; allows submucosal transglottic spread
- Pre-epiglottic space - anterior to epiglottis; tumors here = T3 or higher
- Anterior commissure - where both cords meet anteriorly; tumors here spread easily to opposite cord or subglottis
Q9. How does laryngeal cancer spread?
Direct spread:
- Glottic → subglottis, supraglottis (transglottic), thyroid cartilage
- Supraglottic → pre-epiglottic space, base of tongue, pyriform sinus
- Subglottic → cricoid cartilage, thyroid gland
Lymphatic spread:
- Glottis: Low rate (T1/T2 <5%); T3/T4 up to 20-25%
- Supraglottis: HIGH rate (25-50%); bilateral drainage → treat BOTH sides of neck
- Subglottis: Level VI (paratracheal) nodes + superior mediastinum
- Mainly spreads to levels II, III, IV
Distant (hematogenous):
- Most common = lungs
- A pulmonary nodule in a laryngeal cancer patient is more likely a second primary than metastasis
Q10. What is the TNM staging? (AJCC 8th edition)
Glottic Staging
| Stage | Description |
|---|---|
| T1a | Limited to one vocal fold, normal movement |
| T1b | Both vocal folds, normal movement |
| T2 | Extends to subglottis or supraglottis, OR impaired vocal fold mobility |
| T3 | Vocal fold fixation OR invasion of paraglottic space / inner cortex of thyroid cartilage |
| T4a | Invades thyroid cartilage or beyond larynx (moderately advanced) |
| T4b | Invades prevertebral fascia, encases carotid, or invades mediastinum (very advanced - unresectable) |
Supraglottic Staging
| Stage | Description |
|---|---|
| T1 | Limited to one subsite, normal cord movement |
| T2 | More than one subsite OR spreads outside supraglottis, without cord fixation |
| T3 | Vocal fold fixation OR invasion of pre-epiglottic space / paraglottic space / inner cortex of thyroid cartilage |
| T4a | Invades thyroid cartilage or beyond larynx |
| T4b | Unresectable - prevertebral fascia, carotid, mediastinum |
Nodal Staging (N)
| Stage | Description |
|---|---|
| N0 | No nodes |
| N1 | Single ipsilateral node ≤3 cm, no extranodal extension (ENE) |
| N2a | Single ipsilateral node ≤3 cm with ENE, or 3-6 cm without ENE |
| N2b | Multiple ipsilateral nodes ≤6 cm, no ENE |
| N2c | Bilateral/contralateral nodes ≤6 cm, no ENE |
| N3a | Node >6 cm, no ENE |
| N3b | Any node with clinical ENE |
Q11. How do you investigate a patient with suspected laryngeal cancer?
History: smoking, alcohol, duration of hoarseness, dysphagia, weight loss, ear pain
Examination:
- Voice quality
- Neck - lymphadenopathy (size, fixity)
- Flexible laryngoscopy - direct view of cords - gold standard for initial assessment
- Videostroboscopy - assess cord movement
Biopsy:
- Direct laryngoscopy + biopsy under GA - to confirm histology, assess tumor extent, plan surgery
- FNA of palpable neck node
Imaging:
- CT neck - extent of disease, cartilage invasion, nodes
- MRI neck - better for cartilage invasion assessment
- CT chest - pulmonary metastasis / second primary
- PET/CT - for advanced disease; alters management in 20-30% of patients
Labs: CBC, electrolytes, LFTs, prealbumin/albumin (nutritional status), ECG
Q12. How do you treat laryngeal cancer?
Early disease (Stage I/II = T1-T2, N0):
Single-modality treatment - either radiation OR surgery
| Option | Key Points |
|---|---|
| Radiotherapy | 60-70 Gy over 6 weeks. Local control 90-98% for T1. Better voice outcomes than surgery. Useful for poor surgical candidates. |
| Transoral Laser Microsurgery (TLM) | Preferred surgical approach. No tracheotomy needed. Same cure rate as open surgery but less morbidity. Preserves radiation as a future option. |
| Open partial laryngectomy | Now mainly salvage. Vertical partial laryngectomy (VPL) or supraglottic laryngectomy. |
Advanced disease (Stage III/IV = T3-T4):
Multimodality approach
| Option | When Used |
|---|---|
| Concurrent chemoradiation (cisplatin + RT) | Organ preservation for most T3 and T2N+ lesions. Standard of care. RTOG 91-11 landmark study. |
| Induction chemotherapy (cisplatin + 5-FU → RT) | VA Laryngeal Study (1991): equal survival to surgery, 64% laryngeal preservation. |
| Total laryngectomy + adjuvant RT/CRT | T4a disease with cartilage invasion through thyroid cartilage; nonfunctional larynx; failed chemoradiation |
| Cetuximab + RT | For patients who cannot tolerate cisplatin |
Neck management:
- Glottis T1/T2 N0: Neck does not need treatment (occult disease <5%)
- Glottis T3/T4 N0: Treat neck (occult disease rising)
- Supraglottis ANY stage: Treat bilateral necks (30-50% occult disease)
- Clinical N+: Comprehensive neck dissection OR definitive radiation
- Post-CRT: PET/CT at 12 weeks - planned neck dissection only if incomplete response
Q13. What is a Total Laryngectomy?
Removal of the entire larynx. The trachea is brought to a permanent stoma in the neck. The patient breathes through the neck, not the nose/mouth.
Indications:
- T4a with cartilage invasion
- Nonfunctional larynx
- Failed organ preservation treatment
- Bilateral vocal cord fixation
- Subglottic cancer
After laryngectomy - voice rehabilitation:
- Tracheoesophageal puncture (TEP) + prosthesis - MOST PREFERRED. Air diverted through fistula into pharynx produces a neovoice
- Esophageal speech - air swallowed and regurgitated to vibrate pharyngoesophageal segment; mastered by few patients
- Electrolarynx - mechanical device held to neck; monotonous but easy to use
Q14. What are the landmark clinical trials?
| Trial | Key Finding |
|---|---|
| VA Laryngeal Study (1991) | Induction chemo + RT vs total laryngectomy + RT: equal 2-year survival (68%), 64% laryngeal preservation in chemo group. Proved organ preservation is possible without sacrificing survival. |
| RTOG 91-11 (2003, 10-yr follow-up) | Concurrent chemoradiation > induction chemo > RT alone for laryngeal preservation and locoregional control. No difference in overall survival at 10 years (long-term toxicity offsets benefit). |
Q15. What is the prognosis?
| Site | 5-Year Survival |
|---|---|
| Glottis T1-T2 | ~90% (5-year disease-free survival 88%) |
| Glottis T3/T4 | ~50-60% |
| Supraglottis (all stages) | Lower due to late presentation + nodal spread |
| Subglottis | Worst - usually diagnosed late |
- HPV-positive laryngeal tumors have better prognosis
- 25% of laryngeal cancer patients develop a second primary over their lifetime (half in the upper aerodigestive tract)
- Most common distant metastasis site = lungs
Q16. What is verrucous carcinoma?
A special variant of SCC (1-2% of laryngeal cancers).
- Exophytic, warty, well-differentiated
- Histology: pushing margin (not infiltrative)
- Does NOT metastasize unless it has foci of conventional SCC
- Treatment: surgical excision only (no radiotherapy needed, no neck dissection needed)
Quick Viva Summary Table
| Feature | Glottic | Supraglottic | Subglottic |
|---|---|---|---|
| Frequency | 59-75% | 25-40% | <5% |
| Presentation | Early - hoarseness | Late - dysphagia, throat pain | Very late - stridor |
| Nodal spread | Low (<5% T1/T2) | High (25-50%) | Level VI nodes |
| Prognosis | Best | Moderate | Worst |
| Lymphatics | Poor | Rich (bilateral) | Paratracheal |
Sources: K.J. Lee's Essential Otolaryngology, 9e | Cummings Otolaryngology Head and Neck Surgery | Robbins & Kumar Basic Pathology | Goldman-Cecil Medicine
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