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TNM Staging of Medullary Thyroid Cancer
| Tumor Size | Tumor Invasion | Node Positive Status |
Metastasis | |
|---|---|---|---|---|
| Stage 1 | < 2cm | limited to thyroid | NO | NO |
| Stage 2 | 2–4 cm | limited to thyroid | NO | NO |
| Stage 3 | >4 cm | minimal extrathyroidal invasion | YES, level 6 nodes | NO |
| Stage 4 | Any size | Extends beyond the perithyroidal soft tissues | YES lymph nodes outside of level 6 | YES |
