Painless neck lump in a non-smoker with a small tonsillar primary
51-year-old male
§Chief complaint
Lump in the neck for 3 months that does not hurt
§Medical & dental history
- 01Never smoked, minimal alcohol
- 02No comorbidities
- 03Regular dental attender, good oral health
§Clinical examination
- 01Firm, mobile 4 cm cystic-feeling right level II neck node
- 02Asymmetric right tonsil with a subtle exophytic area
- 03Mild referred otalgia; no trismus
- 04No oral cavity lesion identified
§ figuresFigures (2)
Fig. 1Oropharyngeal cancer (from right tonsil, HPV-negative), T4a N2c, 48 year old man.
“OropharyngealCancer, 2017, 6,11-25” · Jmarchn · CC BY-SA 3.0 · Wikimedia Commons
Fig. 2Oropharyngeal cancer (from right tonsil, HPV-negative), T4a N2c, 48 year old man.
“OropharyngealCancer, 2017, 4,11-30” · Jmarchn · CC BY-SA 3.0 · Wikimedia Commons
Verified open-access images only, reproduced for education under their stated licences · no AI-generated or illustrative artwork · HPV-associated Oropharyngeal SCC figures pending faculty review.
§Differential diagnosis
§Final diagnosis
p16-positive HPV-associated squamous cell carcinoma of the right tonsil, cT1 N1 M0 (AJCC 8 HPV-positive staging)
A cystic neck node in an adult over 40 is metastatic carcinoma until proven otherwise — never treat it as a branchial cyst. The small, subtle tonsillar primary with a large nodal mass is characteristic of HPV-driven disease.
§Investigations
- 01Ultrasound-guided core biopsy of the node — SCC, p16 positive
- 02Examination under anaesthesia with tonsillectomy for the primary
- 03MRI neck and CT thorax; PET-CT staging
- 04HPV DNA/RNA confirmation
§Treatment plan
- 01Multidisciplinary management
- 02Transoral robotic surgery with neck dissection, or definitive chemoradiotherapy
- 03De-escalation protocols only within trials
- 04Dental assessment and prevention before radiotherapy
§Surgical procedure
- 01Transoral tonsillectomy with clear margins
- 02Selective neck dissection levels II-IV
§Histopathology report
Non-keratinising squamous cell carcinoma with basaloid morphology, strong diffuse p16 positivity, HPV-16 confirmed. One node positive without extranodal extension.
§Follow-up & outcome
- 01Adjuvant radiotherapy given for nodal disease
- 02Comprehensive dental prevention with fluoride trays and 3-monthly recall
- 03Disease-free at 30 months; excellent functional outcome
§Clinical pearls / learning points
- 01p16 positivity substantially improves prognosis and changes staging, but not the need for full treatment.
- 02Any cystic neck mass in an adult over 40 needs cancer workup, not excision as a branchial cyst.
- 03Pre-radiotherapy dental assessment prevents osteoradionecrosis later.
§ evidenceReferences & Evidence
Current Classification
WHO Classification of Head and Neck Tumours
5th Edition — Volume 9
WHO Classification of Tumours Editorial Board · 2022
The authoritative international classification of head and neck, odontogenic and salivary gland tumours. Current terminology on this site follows this edition.
Evidence summary
Highest level of evidence linked to this page: WHO / Official Classification.
- L1 · Classification — 2
- L4 · Research — 1
- L6 · Textbook — 3
1 linked source was published from 2024 onwards. Where guidance is limited or contested, rely on the higher-level sources above rather than this summary. Educational use only — not a substitute for clinical judgement.
Content last reviewed
September 2026
Evidence last reviewed
September 2026
Next scheduled review
September 2027
Review status
EVIDENCE REVIEWED
Search latest PubMed evidence
Last literature search: 7 September 2026
Current Classification
WHO Classification of Tumours Editorial Board. IARC / World Health Organization · 2022
The authoritative international classification of head and neck, odontogenic and salivary gland tumours. Current terminology on this site follows this edition.
IARC / WHO. IARC · 2022
Continuously updated online edition of the WHO head and neck tumour classification.
Key Research
Ang KK, Harris J, Wheeler R et al.. The New England journal of medicine · 2010 · 363(1):24-35
RTOG 0129 analysis establishing HPV status as an independent prognostic factor in oropharyngeal carcinoma.
Histopathology References
Barnes L. CRC Press · 2008
Detailed histopathological reference for head and neck diagnostic criteria.
Textbook References
Neville BW, Damm DD, Allen CM et al.. Elsevier · 2024
Standard reference textbook of oral and maxillofacial pathology used throughout this atlas.
Rajendran R, Sivapathasundharam B. Elsevier · 2020
Undergraduate and postgraduate oral pathology textbook widely used in BDS and FCPS curricula.
Additional sources cited on this page
- AJCC Cancer Staging Manual, 8th ed.
- WHO Classification of Head and Neck Tumours, 5th ed. (2022).
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