MRI may be helpful in the diagnosis of anaplastic thyroid cancer. MRI may also be performed to detect metastases of anaplastic thyroid cancer to brain and bones.

• MRI uses powerful magnetic forces and radio-frequency waves to make cross-sectional images of organs, tissues, bones, and blood vessel. A computer turns the images into 3-dimensional pictures. It may be used to:^[1][2]

• Check for cancer in the thyroid gland
• Check if the cancer has spread to other tissues such as the lymph nodes, brain, spine or abdominal organ.