The most common symptoms of anaplastic thyroid cancer are the rapid growth of a neck mass and changes to voice and and swallowing. However, rarely does it make people feel bad.
It is also known as undifferentiated thyroid cancer because the cells do not look or behave like typical thyroid cells. The cause of anaplastic thyroid cancer is .
Anaplastic thyroid carcinoma is one of the most aggressive and deadly cancers in humans and accounts for one to two cases per million persons annually.