Nasopharyngeal Carcinoma: TNM Staging
A 3.5 cm mass is identified in the nasopharynx, extending into the left nasal cavity. Imaging also reveals a 4.5 cm lymph node in the supraclavicular region. What is the correct TNM staging of this nasopharyngeal carcinoma?
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Nasopharyngeal Carcinoma TNM Staging: Important Exam Notes
Nasopharyngeal carcinoma is staged using the TNM system, which assesses the primary tumour (T), regional lymph nodes (N) and distant metastasis (M). Correct staging requires assessment of the anatomical extent of the primary lesion and the size, location and distribution of involved nodes.
Primary tumour classification
- T1: Tumour confined to the nasopharynx or extending into the nasal cavity and/or oropharynx without parapharyngeal extension.
- T2: Parapharyngeal extension and/or involvement of adjacent soft tissues.
- T3: Involvement of skull base bone, cervical vertebrae, pterygoid structures or paranasal sinuses.
- T4: Intracranial or cranial nerve involvement, orbital extension, hypopharyngeal involvement, parotid involvement or extensive soft-tissue disease.
Regional lymph node classification
Nodal staging considers the anatomical level of the involved nodes, their laterality, size and extension relative to defined anatomical landmarks. A 4.5 cm node does not qualify as N3 on size alone. The location must be assessed against the applicable staging criteria.
Important examination pearl
Extension into the nasal cavity alone is compatible with T1 disease. Do not upgrade to T2 without the relevant additional anatomical extension. Likewise, a description of a supraclavicular node should be interpreted using its precise anatomical location rather than its label alone.