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Table 1 TNM Classification of Mucosal Melanoma of the Head and Neck

From: Extracutaneous melanomas: a primer for the radiologist

Primary tumour (T)
T3: Mucosal disease
T4a: Moderately advanced disease. Tumour involving deep soft tissue, cartilage, bone or overlying skin
T4b: Very advanced disease. Tumour involving brain, dura, skull base, lower cranial nerves (IX, X, XI,XII), masticator space, carotid artery, prevertebral space or mediastinal structures
Regional lymph nodes (N)
NX: Regional lymph nodes cannot be assessed
N0: No regional lymph node metastases
N1: Regional lymph node metastases present
Distant metastasis (M)
M0: No distant metastasis
M1: Distant metastasis present