<unk>  (magnified at right) arising within ectopic thyroid tissue of a thyroglossal cyst is a rare occurrence (less than 1% of such cysts). According to Surveillance, Epidemiology, and End Results (SEER), the incidence of<unk>  cancer has increased from 4.8 to 14.9 per 100,000 from 1975 to 2012. Females are more likely to get<unk>  cancer when compared to males with incidence ratio of 2.5 to 1 where most of the cancers are diagnosed between 40 and 50 years old in females. However, death rates from<unk>  cancer remains static from 2003 to 2012 at 0.5 per 100,000 men and women. There was an increased incidence of<unk>  cancer from 1910 to 1960 due to the use of ionising radiation in treating childhood head and neck cancers. The incidence decreased after radiation therapy was abandoned. Environmental exposures to radiation such as atomic bombings of Hiroshima and Nagasaki and Chernobyl disaster also causes an increase in childhood<unk>  at 5 to 20 years after the exposure to radiation. Family history of thyroid cancer syndrome such as familial adenomatous polyposis, Carney complex, Multiple endocrine neoplasia type 2 (MEN-2), Werner syndrome, and Cowden syndrome increases the risk of getting<unk>  cancer.
Papillary thyroid cancer
Medullary thyroid cancer
Follicular thyroid cancer
Thyroid lymphoma
Anaplastic thyroid cancer
Thyroid adenoma
Thyroid cancer
Squamous-cell thyroid carcinoma