Thyroid Questions
Posted onQ) Which of the following thyroid cancers do not take up radio active iodine
a) Medullary carcinoma thyroid
b) Papillary carcinoma
c) Follicular carcinoma
d) Hurthle cell carcinoma
Free Answer
a - Medullary carcinoma
Medullary carcinoma of the thyroid is a tumor that arises from the C cells ie the parafollicular cells and not from cells of thyroid follicles.
These are not TSH dependent and hence do not take up radioactive iodine
Hurthle cell carcinoma is a variation of follicular carcinoma only.
In these tumors lymph node involvement is about 60%
Bailey page 769