Thyroid cancer is the most common malignancy of the endocrine system
-Most thyroid cancers occur in the young with only one-third of cases occurring after age 55
-Thyroid cancer can be of follicular cell origin or C-cell origin or lymphoid origin.
Originating from follicular cells
Papillary 80%
Follicular 11%
Hürthle cell 3%
Anaplastic 2%
Originating from C-cells or parafollicular cells
Medullary 4%
Originating from lymphoid cells
Thyroid lymphoma 1%
Most of these carcinomas are treated by surgery, radioiodine, and levothyroxine to suppress TSH