Stage I thyroid cancer
The thyroid cancer staging classification system is very similar for older patients with differentiated tumors and for those with medullary thyroid cancer. Age is not a consideration when classifying medullary cancers.
In stage I of thyroid cancer, the tumor is 2 cm or smaller (less than an inch wide), and has not grown outside the thyroid. It has not spread to nearby lymph nodes or distant sites.
Learn about thyroid cancer treatment options