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