Staging of thyroid cancer
Staging is the process of finding out if and how far a cancer has spread. The stage of a cancer is important in choosing the best treatment. The stage can also help predict the patient’s outlook (prognosis) and chance for a cure.
Staging is based on the results of the physical exam, biopsy, and imaging tests (ultrasound, radioiodine scan, CT scan, MRI, chest x-ray, and/or PET scan), which are described in the section “How is thyroid cancer found?”
The most common system used to describe the stages of thyroid cancer is the American Joint Committee on Cancer (AJCC) TNM system. The stages of thyroid cancer are usually labeled using Roman numerals I through IV (1-4). For most cancers, the lower the number, the less the cancer has spread. Unlike most other cancers, though, thyroid cancer staging also takes into account the patient’s age. This means that a thyroid cancer can have a different stage depending on the age of the patient.
More information about the staging of thyroid cancer can be found in our more detailed document Thyroid Cancer.
Cancer that comes back after treatment is called recurrent (or relapsed). If thyroid cancer returns it is usually in the neck, but it might come back in a different part of the body (for instance, lymph nodes, lungs, or bones). The stage assigned stays the same even if the disease recurs.
If you have any questions about the stage of your cancer or how it affects your treatment options, be sure to ask your doctor.
Last Medical Review: 02/27/2014
Last Revised: 02/12/2016