Primary tumor (T) | |
T category | T criteria |
TX | Primary tumor cannot be assessed |
T1 | Tumor ≤2 cm |
T2 | Tumor >2 to ≤4 cm |
T3 | Tumor >4 cm |
T4 | Tumor with invasion of adjoining structures |
T4a | Tumor with orbital invasion, skull base/dural invasion, invasion of central compartment viscera, involvement of facial skeleton, or invasion of pterygoid muscles |
T4b | Tumor with brain parenchymal invasion, carotid artery encasement, prevertebral muscle invasion, or central nervous system involvement via perineural spread |
Regional lymph nodes (N) | |
N category | N criteria |
N0 | No regional lymph node metastases or unknown lymph node status |
N1 | Regional lymph node metastasis |
Distant metastasis (M) | |
M category | M criteria |
M0 | No distant metastasis |
M1 | Distant metastasis |
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