A 70yr old man presents enlarged hard lymph node in anterior triangle

A 70yr old man presents enlarged hard lymph node in anterior triangle of neck. Biopsy revealed deposit of squamous cell carcinoma. What are the investigations need to find out primary site? a. nasal endoscopy b. Upper GI endoscopy c. CECT thorax d. Bronchoscopy e. Serum calcitonin

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investigations to find primary site cervical lymph node squamous cell carcinoma metastasis unknown primary

Here is a structured answer to this classic ENT/oncology question:

Metastatic SCC in Anterior Triangle Cervical Node — Investigations to Find the Primary Site

When a cervical lymph node biopsy reveals squamous cell carcinoma (SCC), the primary site must be actively sought because management depends on it. Upper and mid-cervical SCC metastases almost always originate from head and neck mucosal sites; low cervical/supraclavicular nodes may indicate a thoracic or GI primary.

The standard workup is essentially a panendoscopy of the upper aerodigestive tract, combined with imaging.

Evaluating Each Option:

Option	Relevant?	Rationale
a. Nasal endoscopy	✅ YES	Examines the nasopharynx, nasal cavity, and posterior nasal space — common sites for SCC primaries (especially nasopharyngeal carcinoma). This is part of the standard workup.
b. Upper GI endoscopy	✅ YES	Examines the esophagus and hypopharynx. Hypopharyngeal and esophageal SCC can present with cervical nodal metastases. Esophagoscopy is part of the panendoscopy protocol.
c. CECT thorax	✅ YES	Detects lung primary or mediastinal involvement, especially relevant when lower cervical nodes are involved. Lung SCC can metastasize to supraclavicular/lower cervical nodes.
d. Bronchoscopy	✅ YES	Examines the tracheobronchial tree for lung/bronchial SCC. Particularly indicated when low cervical (level IV–V) nodes are involved or CECT thorax shows a lung lesion.
e. Serum calcitonin	❌ NO	Calcitonin is a marker for medullary thyroid carcinoma (parafollicular C-cell origin), not SCC. It has no role in the workup of cervical SCC metastasis.

The Correct Answer: a, b, c, d (all except e)

Serum calcitonin (e) is the only option NOT indicated. It would be relevant if biopsy showed medullary thyroid carcinoma, not SCC.

Standard Workup Protocol for Occult Primary SCC

Panendoscopy (done under GA):
- Nasopharyngoscopy / nasal endoscopy — nasopharynx, nasal cavity
- Laryngoscopy — larynx and hypopharynx
- Esophagoscopy (upper GI endoscopy) — hypopharynx and esophagus
- Bronchoscopy — if lower cervical nodes or lung lesion suspected
Imaging:
- CECT neck + thorax (or PET-CT) — identifies lung primaries, maps nodal extent
- PET-CT identifies a primary in 15–30% of cases missed by endoscopy
Directed biopsies of the nasopharynx, base of tongue, and pyriform fossa even if mucosa appears normal, as SCC commonly arises submucosally at these sites.
HPV/p16 testing on biopsy tissue — if p16-positive, strongly suggests an oropharyngeal primary (tonsil or base of tongue).

This workup identifies a primary site in 85–90% of cases — CancerNetwork / NCI guidelines.

Bottom line: Options a, b, c, and d are all appropriate investigations. Option e (serum calcitonin) is incorrect — it is a marker for medullary thyroid carcinoma, not squamous cell carcinoma.

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