A 61-year-old woman comes to the office due to a neck lump. There is a nontender, firm nodule in the left lobe of the thyroid. Serum TSH is normal. Ultrasonography reveals a 2-cm hypoechoic nodule with increased central blood flow. Fine-needle aspiration biopsy shows clusters of cells with large, overlapping nuclei containing sparse, finely dispersed chromatin, plus numerous intranuclear inclusion bodies and grooves. Which of the following is the most likely diagnosis?
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