What is Thyroid Cancer? (Definition)
Thyroid cancer is a form of cancer which starts in the thyroid gland. Thyroid cancer does not always cause symptoms; often, the first sign of thyroid cancer is a thyroid nodule. According to the American Thyroid Association, thyroid cancer is usually very treatable and is often cured with surgery and, if indicated, radioactive iodine.
The main types of thyroid cancer are:
- Differentiated (including papillary, follicular and Hṻrthle cell)
- Anaplastic (an aggressive undifferentiated tumor)
Even when thyroid cancer is more advanced, effective treatment is available for the most common forms of thyroid cancer. The prognosis for most patients with papillary and follicular thyroid cancer is usually excellent.
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