Salivary gland tumor staging

Salivary gland tumor Microchapters
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Stage	Tumor location
TX	Primary tumor cannot be assessed
T0	No evidence of a primary tumor
T1	Tumor ≤2 cm in greatest dimension without extraparenchymal extension.
T2	Tumor >2 cm but ≤4 cm in greatest dimension without extraparenchymal extension
T3	Tumor >4 cm and/or tumor having extraparenchymal extension.
T4a	Moderately advanced disease. Tumor invades skin, mandible, ear canal, and/or facial nerve.
T4b	Very advanced disease. Tumor invades skull base and/or pterygoid plates and/or encases carotid artery.

N classification	Nodal Mass
NX	Regional lymph nodes cannot be assessed
N0	No regional lymph node metastasis.
N1	Metastasis in a single ipsilateral lymph node, ≤3 cm in greatest dimension.
N2	Metastasis in a single ipsilateral lymph node, >3 cm but ≤6 cm in greatest dimension. Metastases in multiple ipsilateral lymph nodes, ≤6 cm in greatest dimension. Metastases in bilateral or contralateral lymph nodes, ≤6 cm in greatest dimension.
N2a	Metastasis in a single ipsilateral lymph node, >3 cm but ≤6 cm in greatest dimension
N2b	Metastases in multiple ipsilateral lymph nodes, ≤6 cm in greatest dimension.
N2c	Metastases in bilateral or contralateral lymph nodes, ≤6 cm in greatest dimension.
N3	Metastases in bilateral or contralateral lymph nodes, ≤6 cm in greatest dimension.

N classification	Nodal Mass
M0	No distant metastasis
M1	Distant metastasis