Version June 2024
| Primary tumor (T) | ||||
| Papillary, follicular, poorly differentiated, Hürthle cell and anaplastic thyroid carcinoma | ||||
| T category | T criteria | |||
| TX | Primary tumor cannot be assessed | |||
| T0 | No evidence of primary tumor | |||
| T1 | Tumor ≤2 cm in greatest dimension limited to the thyroid | |||
| T1a | Tumor ≤1 cm in greatest dimension limited to the thyroid | |||
| T1b | Tumor >1 cm but ≤2 cm in greatest dimension limited to the thyroid | |||
| T2 | Tumor >2 cm but ≤4 cm in greatest dimension limited to the thyroid | |||
| T3 | Tumor >4 cm limited to the thyroid, or gross extrathyroidal extension invading only strap muscles | |||
| T3a | Tumor >4 cm limited to the thyroid | |||
| T3b | Gross extrathyroidal extension invading only strap muscles (sternohyoid, sternothyroid, thyrohyoid, or omohyoid muscles) from a tumor of any size | |||
| T4 | Includes gross extrathyroidal extension beyond the strap muscles | |||
| T4a | Gross extrathyroidal extension invading subcutaneous soft tissues, larynx, trachea, esophagus, or recurrent laryngeal nerve from a tumor of any size | |||
| T4b | Gross extrathyroidal extension invading prevertebral fascia or encasing the carotid artery or mediastinal vessels from a tumor of any size | |||
| NOTE: All categories may be subdivided: (s) solitary tumor and (m) multifocal tumor (the largest tumor determines the classification). | ||||
| Regional lymph nodes (N) | ||||
| N category | N criteria | |||
| NX | Regional lymph nodes cannot be assessed | |||
| N0 | No evidence of locoregional lymph node metastasis | |||
| N0a | One or more cytologically or histologically confirmed benign lymph nodes | |||
| N0b | No radiologic or clinical evidence of locoregional lymph node metastasis | |||
| N1 | Metastasis to regional nodes | |||
| N1a | Metastasis to level VI or VII (pretracheal, paratracheal, or prelaryngeal/Delphian, or upper mediastinal) lymph nodes. This can be unilateral or bilateral disease. | |||
| N1b | Metastasis to unilateral, bilateral, or contralateral lateral neck lymph nodes (levels I, II, III, IV, or V) or retropharyngeal lymph nodes | |||
| Distant metastasis (M) | ||||
| M category | M criteria | |||
| M0 | No distant metastasis | |||
| M1 | Distant metastasis | |||
| Prognostic stage groups | ||||
| Differentiated | ||||
| When age at diagnosis is... | And T is... | And N is... | And M is... | Then the stage group is... |
| <55 years | Any T | Any N | M0 | I |
| <55 years | Any T | Any N | M1 | II |
| ≥55 years | T1 | N0/NX | M0 | I |
| ≥55 years | T1 | N1 | M0 | II |
| ≥55 years | T2 | N0/NX | M0 | I |
| ≥55 years | T2 | N1 | M0 | II |
| ≥55 years | T3a/T3b | Any N | M0 | II |
| ≥55 years | T4a | Any N | M0 | III |
| ≥55 years | T4b | Any N | M0 | IVA |
| ≥55 years | Any T | Any N | M1 | IVB |
| Anaplastic | ||||
| When T is... | And N is... | And M is... | Then the stage group is... | |
| T1-T3a | N0/NX | M0 | IVA | |
| T1-T3a | N1 | M0 | IVB | |
| T3b | Any N | M0 | IVB | |
| T4 | Any N | M0 | IVB | |
| Any T | Any N | M1 | IVC | |
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