Journal of Thyroid Research / 2010 / Article / Tab 4

Review Article

Old and New Insights in the Treatment of Thyroid Carcinoma

Table 4

TNM classification system for thyroid carcinoma.

TNM Classification System
T1 Tumor diameter 2 cm or smaller
T2 Primary tumor diameter > 2 to 4 cm.
T3
Primary tumor diameter > 4 cm limited to the thyroid or with
minimal extracapsular
extension
T4a
Tumor of any size extending beyond the thyroid capsule to
invade the subcutaneous soft
tissues, larynx, trachea, esophagus, or recurrent laryngeal nerve
T4b Tumor invades prevertebral fascia or encases carotid artery
or mediastinal nerves
Tx Primary tumor size unknown, but without extrathyroid
extension
N0 No metastatic nodes
N1a Metastasis to level VI (pretracheal, paratracheal, prelaryngeal)
NIb Metastasis to unilateral or bilateral or contralateralcervical
or superior mediastinum
Nx Nodes not assessed at surgery
M0 No distant metastasis
M1 Distant metastasis

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