A 48-year-old woman has a slowly enlarging thyroid nodule, intermittent diarrhoea and facial flushing. Her TSH is 1.6 mIU/L (0.4–4.0), and serum calcitonin is 1850 ng/L (less than 10). Ultrasound shows several enlarged central cervical lymph nodes. Which thyroid malignancy is most likely?
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