A 30-year-old man comes to the office with a neck lump discovered incidentally. His history is significant for a recently removed pheochromocytoma, and his father died of thyroid cancer in his 30s. Ultrasound reveals a hypoechoic 3-cm nodule in the right lobe of the thyroid. Fine-needle biopsy is consistent with a subtype of thyroid cancer, and the patient undergoes total thyroidectomy. Which of the following is the most likely histological finding?
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