Least common thyroid malignancy is:
Least common thyroid malignancy is anaplastic. Most common thyroid malignancy - Papillary > Follicular > Medullary > Anaplastic Papillary carcinoma - 80% occur in Iodine-sufficient areas and predominant thyroid cancer in children and individuals exposed to external radiation. Follicular carcinomas - 10% of thyroid cancers and occur more commonly in iodine-deficient areas. MTC- about 5% Anaplastic carcinoma- about 1%
Papillary
Follicular
Medullary
Anaplastic
Thyroid