• MRI and CT have very little role in the detection and assessment of thyroid cancer confined to the thyroid gland, a situation much better assessed with ultrasound.
• MRI or CT is indicated where there is a suspicion of a locally advanced tumor or in the assessment of recurrent disease.
• In the context of staging, both MRI and CT will demonstrate local invasion of critical structures (such as the aerodigestive tract) by thyroid cancer, although MRI is likely to be more accurate.
• CT is still the investigation of choice for the assessment of pulmonary metastases.
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