NCIt definition : Stage IVA includes: T1-T3a, N0/NX, M0. T1: Tumor measuring 2 cm or less in greatest
dimension limited to the thyroid. T2: Tumor measuring more than 2 cm but 4 cm or less
in greatest dimension limited to the thyroid. T3a: Tumor measuring more than 4 cm
in greatest dimension limited to the thyroid. N0: No evidence of locoregional lymph
node metastasis. NX: Regional lymph nodes cannot be assessed. M0: No distant metastasis.
(from AJCC 8th Ed.);