Soft tissue sarcoma of the head and neck TNM staging AJCC UICC 8th edition*

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

TNM: tumor, node, metastasis; AJCC: American Joint Committee on Cancer; UICC: Union for International Cancer Control.
* This is a new classification that needs data collection before defining a prognostic stage grouping.

Used with permission of the American College of Surgeons, Chicago, Illinois. The original source for this information is the AJCC Cancer Staging Manual, Eighth Edition (2017) published by Springer International Publishing.

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Soft tissue sarcoma of the head and neck TNM staging AJCC UICC 8th edition*