AIM • STEP 10
3rd Year MBBS
3rd Year MBBS
Student Memory Support
Topic 5 — Laryngeal Anatomy, Inflammation and Tumours
High-yield memory reinforcement and last-minute KMU revision.
1. High-Yield Flashcards
Tap each question to reveal the answer.
Which cartilage forms the largest part of the anterior and lateral laryngeal framework?
Thyroid cartilage.
Which paired cartilages control the position and tension of the vocal folds?
Arytenoid cartilages.
What is the opening between the true vocal folds called?
Rima glottidis.
Which laryngeal folds are primarily responsible for phonation?
True vocal folds.
What functional change produces hoarseness in laryngitis?
Inflamed, edematous vocal folds vibrate abnormally.
What are important contributors to chronic laryngeal irritation?
Smoking, voice abuse, reflux and repeated irritant exposure.
What is the key supportive management principle in uncomplicated acute laryngitis?
Voice rest, hydration and avoidance of irritants.
What is the major risk factor for laryngeal carcinoma?
Tobacco smoking.
Which histological type accounts for the major malignant tumour of the larynx?
Squamous cell carcinoma.
What morphological finding supports squamous differentiation in laryngeal carcinoma?
Keratinization, including keratin pearl formation.
What distinguishes carcinoma in situ from invasive laryngeal carcinoma?
Invasion through the basement membrane into underlying stroma.
Why may a small glottic tumour cause symptoms relatively early?
It interferes directly with vocal-fold vibration, producing hoarseness.
Why is cervical lymph-node involvement more important in supraglottic carcinoma?
The supraglottic region has more effective lymphatic drainage than the true vocal folds.
What do T, N and M represent in laryngeal tumour staging?
Primary tumour extent, regional lymph nodes and distant metastasis.
Which persistent symptom in a smoker should raise concern for laryngeal malignancy?
Persistent hoarseness.
2. Mnemonics
Mnemonic Title: Chronic Laryngeal Irritants
Mnemonic Word: SVRI
Meaning: Smoking • Voice abuse • Reflux • Inhaled irritants
Mnemonic Title: Laryngeal Cancer Progression
Mnemonic Word: DCI
Meaning: Dysplasia → Carcinoma in situ → Invasive carcinoma
Mnemonic Title: TNM Staging
Mnemonic Word: TNM
Meaning: Tumour extent • Nodal involvement • distant Metastasis
3. Memory Tables
Acute vs Chronic Laryngitis
| Feature | Acute Laryngitis | Chronic Laryngitis |
|---|---|---|
| Typical setting | Acute infection or irritation | Persistent irritation |
| Voice symptom | Transient hoarseness | Persistent/recurrent hoarseness |
| Important contributors | Infection, voice strain | Smoking, reflux, voice abuse, irritants |
| Management focus | Supportive care | Remove or treat contributing factor |
Glottic vs Supraglottic Tumour
| Feature | Glottic | Supraglottic |
|---|---|---|
| Key early clue | Hoarseness | Throat/swallowing symptoms |
| Reason | Early disturbance of vocal-fold vibration | Location above true vocal folds |
| Lymphatic spread | Relatively limited early | Regional nodal spread more important |
4. Rapid Revision Points — Last-Minute Revision
Must Remember:
- True vocal folds are the principal structures responsible for normal phonation.
- Rima glottidis is the opening between the true vocal folds.
- Laryngeal inflammation causes edema and abnormal vocal-fold vibration → hoarseness.
- Uncomplicated acute laryngitis is managed mainly with voice rest, hydration and irritant avoidance.
- Smoking, reflux, voice abuse and inhaled irritants contribute to chronic laryngitis.
- Tobacco smoking is the major risk factor for laryngeal squamous cell carcinoma.
- Laryngeal carcinoma may show exophytic or ulcerative gross growth.
- Keratinization supports squamous differentiation.
- Glottic tumours tend to produce earlier hoarseness because they affect vocal-fold vibration.
- Supraglottic tumours have greater potential for regional lymph-node involvement.
- Basement-membrane penetration distinguishes invasive carcinoma from carcinoma in situ.
- TNM summarizes primary tumour extent, regional nodes and distant metastasis.
KMU Trap: Severe epithelial atypia alone does not prove invasion. Invasion requires malignant cells to cross the basement membrane into underlying stroma.
5. Clinical Memory Hooks
Upper respiratory illness followed by hoarseness
→
inflamed, edematous vocal folds causing abnormal vibration
→
inflamed, edematous vocal folds causing abnormal vibration
Recurrent hoarseness with reflux or heavy voice use
→
persistent laryngeal irritation contributing to chronic laryngitis
→
persistent laryngeal irritation contributing to chronic laryngitis
Long-term smoker with persistent hoarseness
→
consider laryngeal squamous cell carcinoma
→
consider laryngeal squamous cell carcinoma
Small lesion on the true vocal fold
→
disturbed vibration
→
early voice change
→
disturbed vibration
→
early voice change
Supraglottic tumour with cervical node enlargement
→
regional lymphatic spread
→
regional lymphatic spread
6. Starred High-Yield Exam Points
- ⭐ Persistent hoarseness in a smoker is an important clue requiring evaluation for laryngeal malignancy.
- ⭐ Squamous cell carcinoma is the major malignant epithelial tumour of the larynx.
- ⭐ Glottic carcinoma produces early hoarseness because it directly interferes with true vocal-fold vibration.
- ⭐ Supraglottic carcinoma has greater regional nodal spread because of richer lymphatic drainage.
- ⭐ Carcinoma in situ remains above the basement membrane; stromal penetration indicates invasive carcinoma.
- ⭐ Keratin pearls support squamous differentiation in a laryngeal carcinoma.
- ⭐ TNM staging records local tumour extent, regional lymph-node involvement and distant metastasis.