Academe Learn
CBME Curriculum Preview

Page 24 of 44

EN2.8 | Premalignant and Malignant ENT Screening — SDL Guide

Learning Objectives

  • Identify high-risk patients and enumerate the major risk factors for ENT malignancies
  • Perform a systematic clinical examination to identify premalignant and malignant lesions of the oral cavity, oropharynx, larynx, and neck
  • Recognise leukoplakia, erythroplakia, submucous fibrosis, and laryngeal carcinoma on clinical examination
  • Identify the characteristic presentation of nasopharyngeal carcinoma
  • Initiate the appropriate diagnostic pathway for a suspected ENT malignancy

INSTRUCTIONS

Head-and-neck cancer is the commonest cancer in Indian males and a significant cause of cancer mortality in both sexes in South Asia. Most of these cancers are accessible to clinical examination — they can be seen and felt before any investigation is performed. This module teaches the clinical skill of identifying premalignant and malignant ENT lesions: the risk factors that should heighten suspicion, the examination technique to detect early lesions, and the site-specific patterns that guide diagnosis.

References

  • Dhingra PL, Dhingra S. Diseases of Ear, Nose and Throat & Head and Neck Surgery, 8th ed. Ch on tumours (textbook)
  • Hazarika P. Textbook of Ear, Nose and Throat & Head Neck Surgery, 3rd ed. Ch on malignancy (textbook)
  • Scott-Brown's Otorhinolaryngology Head and Neck Surgery, 8th ed. Oncology chapters (textbook)

Version 2.0 | NMC CBUC 2024

CLINICAL SCENARIO

You are doing a general outpatient clinic. A 52-year-old male tobacco chewer comes in for an unrelated complaint — a minor skin rash. While examining him, you notice he opens his mouth with difficulty (trismus). You ask him to open wider; he can barely separate his teeth by 2 cm. You look inside his mouth and see pale, fibrous, blanched mucosa on both cheeks. On the left buccal mucosa, you also notice a raised white patch that cannot be rubbed off with a gauze. He says 'it's been there for years.' What is the significance of what you are seeing — and what would you do next?

WHY THIS MATTERS

Head-and-neck squamous cell carcinoma (HNSCC) is the sixth most common cancer worldwide and the most common cancer in Indian males, largely driven by tobacco and betel nut use. The critical clinical fact is that most early head-and-neck cancers and premalignant lesions are visible to the naked eye during a routine clinical examination — they do not require imaging or endoscopy for initial identification. A clinician who recognises leukoplakia, erythroplakia, or submucous fibrosis early and acts on it can prevent the progression to invasive SCC. Conversely, a clinician who misses a persistent ulcer on the tongue base or a progressively thickened laryngeal fold will encounter the patient again months later with an advanced, potentially incurable tumour. EN2.8 designates this as an SH-level skill: you must be able to identify these lesions during a clinical examination, not merely recognise them from textbook descriptions.

RECALL

Recall from your pathology studies that carcinogenesis in the head and neck follows the classic dysplasia-carcinoma sequence: normal epithelium → hyperplasia → mild dysplasia → moderate dysplasia → severe dysplasia/carcinoma in situ → invasive SCC. Each step involves progressive loss of normal cell architecture, increased nuclear pleomorphism, loss of polarity, and basement membrane disruption (at the invasive stage). The major carcinogens in the head and neck are: tobacco (smoked and smokeless — releases nitrosamines and polycyclic aromatic hydrocarbons that directly damage DNA), alcohol (synergistic with tobacco — acts as a solvent, increasing carcinogen penetration into the mucosa), betel nut/areca nut (contains arecoline, a direct mitogen — specific to South and Southeast Asia; associated with oral submucous fibrosis), HPV (human papillomavirus) types 16 and 18 (oncoproteins E6 and E7 inactivate p53 and Rb tumour suppressor genes — associated with oropharyngeal SCC, particularly tonsillar), and EBV (Epstein-Barr virus) (associated with nasopharyngeal carcinoma, particularly in Southeast Asia and Cantonese populations). The left recurrent laryngeal nerve has a longer intrathoracic course (loops around the aortic arch) — damage from mediastinal lymphadenopathy or tumour invasion causes left vocal cord palsy.

Clinical Indication: Why ENT Cancer Screening Is a Core Clinical Skill

The head and neck region is unique in oncology: nearly all of its malignancies arise from mucosal surfaces that are directly accessible to clinical examination — the oral cavity is inspected with a torch and tongue depressor; the oropharynx is visualised with the Boyle-Davis gag or a tongue depressor; the larynx is visualised with indirect laryngoscopy or fibreoptic nasopharyngoscopy; the neck nodes are palpated. This accessibility means that clinical examination is not merely a preliminary step to imaging — it IS the primary diagnostic tool for early lesion identification. A patient in whom a 5 mm leukoplakic patch or an early glottic lesion is identified on examination can be treated with excision or early radiotherapy with a cure rate approaching 90–95%. The same patient presenting 2 years later with a T4 lesion and bilateral cervical metastases has a 5-year survival below 30%.

The burden of head-and-neck cancer in India is staggering: it accounts for approximately 30% of all cancers in Indian males (compared to 4–5% in Western countries), largely because of the extremely high prevalence of tobacco and betel nut use. Oral cancer, laryngeal cancer, and hypopharyngeal cancer are all accessible to detection at a primary care level — a fact that makes ENT screening a genuine public health intervention, not merely a specialist skill.

EN2.8 requires you to: (1) enumerate suspect high-risk patients and risk factors — meaning you apply a systematic risk stratification at every relevant encounter; (2) identify by clinical examination malignant and premalignant ENT diseases — meaning you perform a structured ENT examination specifically looking for these lesions whenever a patient presents with risk factors or suspicious symptoms. This SDL trains both skills.

Risk Factors and High-Risk Patient Profiles

The ability to rapidly identify a high-risk patient — before beginning the examination — directs your attention and increases the sensitivity of your clinical examination. High-risk profiling is the cognitive front-end of cancer screening.

Tobacco is the single most important risk factor for ENT malignancies. Both smoked tobacco (cigarettes, beedis) and smokeless tobacco (khaini, gutka, paan masala) are carcinogenic. Smokeless tobacco is particularly associated with oral cavity SCC (buccal mucosa, alveolus, lip). The risk increases with quantity and duration: a 40 pack-year smoker has a 10-fold increased risk of laryngeal carcinoma compared to a non-smoker.

Alcohol acts synergistically with tobacco: the combined risk of laryngeal and hypopharyngeal SCC in a heavy smoker who is also a heavy drinker is multiplicative (up to 35× baseline risk), not simply additive.

Betel nut (areca nut) is chewed by hundreds of millions of people across South and Southeast Asia. The active alkaloid arecoline is a direct mitogen and causes oral submucous fibrosis (OSMF) — a premalignant condition of the oral mucosa characterised by progressive submucosal fibrosis, leading to trismus, pallor of the oral mucosa, and progressive loss of mouth opening. OSMF has a malignant transformation rate of approximately 7–12%, much higher than leukoplakia alone.

HPV (types 16, 18) is an emerging cause of oropharyngeal SCC, particularly tonsillar carcinoma and base of tongue carcinoma in younger patients without conventional tobacco/alcohol risk factors. HPV-positive oropharyngeal SCC has a better prognosis than HPV-negative.

EBV is strongly associated with nasopharyngeal carcinoma (NPC), particularly the undifferentiated (Type III WHO) subtype. NPC is endemic in South China and Southeast Asia (Cantonese ethnic group at highest risk) and has a characteristic age distribution with two peaks: adolescents/young adults and adults >40 years. The clinical triad of NPC is: (1) cervical lymphadenopathy (typically bilateral, high jugular chain, often the first presentation); (2) nasal symptoms (obstruction, bloodstained rhinorrhoea); (3) serous otitis media (Eustachian tube obstruction by nasopharyngeal tumour).

High-risk patient profiles:
- Middle-aged male + heavy smoker + heavy drinker → screen for oral cavity, laryngeal, hypopharyngeal SCC
- Any patient + daily betel nut chewing → screen for OSMF + oral SCC
- Young adult in South/SE Asian population + cervical nodes + ear symptoms + nasal obstruction → screen for NPC
- Post-radiotherapy (previous head/neck cancer) → screen for second primary
- Any adult with HIV/immunosuppression → head-and-neck malignancy risk increased

SELF-CHECK

A 25-year-old male from Tamil Nadu presents with progressive bilateral neck swelling, left-sided hearing loss, and recurrent bloodstained nasal discharge for 4 months. The most likely diagnosis is:

A. Bilateral CSOM with intracranial complication

B. Nasopharyngeal carcinoma (NPC)

C. Lymphoma of the neck

D. Juvenile nasopharyngeal angiofibroma

Reveal Answer

Answer: B. Nasopharyngeal carcinoma (NPC)

The triad of bilateral cervical lymphadenopathy + serous otitis media (hearing loss from Eustachian tube obstruction) + bloodstained nasal discharge/obstruction in a young adult from South/Southeast Asia is the classic presentation of nasopharyngeal carcinoma (NPC). NPC is EBV-associated, common in South/Southeast Asia (Cantonese and South Indian populations at higher risk), and presents at a younger age than most other head-and-neck cancers. JNA typically presents in adolescent males with unilateral obstruction and severe epistaxis, without bilateral cervical nodes. CSOM complications present differently.

Clinical Examination for Premalignant and Malignant ENT Lesions

The clinical examination for ENT malignancy is a structured, region-by-region survey of the visible mucosae and the palpable soft tissues of the neck. It must be performed systematically, not opportunistically, in any patient who carries identified risk factors or presents with suspicious symptoms.

Oral cavity examination:
With good light (torch or headlamp) and a tongue depressor, examine sequentially: the lips (vermilion border and inner surface), the buccal mucosa (both sides), the hard palate, the upper and lower gingival margins, the floor of the mouth (ask patient to lift the tongue), the tongue (anterior two-thirds, lateral borders — most common site of tongue SCC — and dorsal surface), and the alveolar ridges. Look for: white patches (leukoplakia), red patches (erythroplakia), mixed red-white patches, ulcers (well-defined vs irregular, indurated edge), fibrous bands and pallor (OSMF), and any mass. Palpate any suspicious lesion between gloved fingers for induration (firmness) — induration in a mucosal lesion suggests invasive SCC. Assess mouth opening — trismus (reduced mouth opening) indicates either infective (e.g. peritonsillar abscess) or malignant infiltration of the pterygoid muscles.

Oropharynx examination:
Using a tongue depressor and headlamp, examine the soft palate (motility — palatal palsy suggests skull base involvement), uvula, tonsillar fossae, anterior and posterior pillars, and posterior pharyngeal wall. Look for ulcers, asymmetric tonsillar enlargement (a single grossly enlarged, firm, non-tender tonsil in a middle-aged adult is SCC until proven otherwise, not simple hypertrophy), mucosal irregularity, and submucosal bulging.

Larynx (indirect laryngoscopy):
The larynx is not directly visible with a tongue depressor — it requires indirect laryngoscopy (warmed laryngeal mirror or fibreoptic nasopharyngoscope). Ask the patient to protrude the tongue, grasp it gently with a gauze, and pass a warmed No. 4 or No. 5 laryngeal mirror to the uvula. Using the headlamp beam reflected off the mirror, view the larynx. Look for: vocal cord mobility (paralysis = nerve invasion or mediastinal pathology), vocal cord thickening or white/irregular lesion (laryngeal keratosis or carcinoma), subglottic extension. Persistent hoarseness >3 weeks mandates this examination.

Neck palpation:
Palpate all neck levels (I–VI) systematically from behind the patient. Note any nodes: size (>1 cm = enlarged), consistency (soft/rubbery = reactive/lymphoma; firm/hard = metastatic SCC), tenderness (inflammatory = tender; malignant = usually non-tender), fixation to underlying structures, and skin involvement. A matted cluster of hard, non-tender nodes in an adult smoker is metastatic SCC until proven otherwise. Palpate the thyroid for nodules (solitary cold nodule = higher malignancy risk).