T:

Primary Tumor

T₀:

No evidence of primary tumor

T₁:

Tumor 1 cm or less in greatest dimension, limited to the thyroid

T₂:

Tumor more than 1 cm but not more than 4 cm in greatest dimension, limited to the thyroid.

T₃:

Tumor more than 4 cm in greatest dimension, limited to the thyroid.

T₄:

Tumor of any size extending beyond the thyroid capsule.

N:

Regional Lymph Nodes

N₀:

No regional lymph node metastasis

N₁:

Regional lymph node metastasis

N_1a:

Metastasis in ipsilateral cervical lymph node/nodes

N_1b:

Metastasis in bilateral, middle or contralateral cervical or mediastinal lymph node/nodes

M:

Distant Metastasis

M₀:

No distant metastasis

M₁:

Distant metastasis