Primary tumor (T) | |
T category | T criteria |
T3 | Tumors limited to the mucosa and immediately underlying soft tissue, regardless of thickness or greatest dimension; for example, polypoid nasal disease, pigmented or nonpigmented lesions of the oral cavity, pharynx, or larynx |
T4 | Moderately advanced or very advanced |
T4a | Moderately advanced disease. Tumor involving deep soft tissue, cartilage, bone, or overlying skin. |
T4b | Very advanced disease. Tumor 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) | |
N category | N criteria |
NX | Regional lymph nodes cannot be assessed |
N0 | No regional lymph node metastases |
N1 | Regional lymph node metastases present |
Distant metastasis (M) | |
M category | M criteria |
M0 | No distant metastasis |
M1 | Distant metastasis present |
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