May have high signal with the T1 weighted MR images. Malignant Neoplasms of the Thyroid Thyroid Cancer Eighty percent are papillary, follicular, or mixed. Ten percent medullary. Three percent anaplastic. Papillary carcinomas tend to spread by lymphatic means and often occur in young patients under the age of forty.
Follicular carcinomas tend to spread hematogenously.
Non-Hodgkin's Lymphoma May present as a solitary nodule or diffuse enlargement of the thyroid. With or without associated large lymph nodes and expansion of Waldeyer's Ring. May arise extremely rapidly. Metastasis to the Thyroid Especially lung, breast, renal. Parathyroid Glands Usually located to the thyroid.