Q. A 45-year-old woman with a history of hypertension and hyperlipidemia presents to her primary care physician with a complaint of a gradually enlarging, painless, solitary nodule in her neck that she first noticed 6 months ago. The patient's vital signs are within normal limits. On examination, the nodule is firm, mobile, non-tender, and measures 2 cm in diameter. She undergoes a thyroid function test which reveals a normal TSH level and a slightly elevated free T4 level. Fine-needle aspiration is performed and the histopathology demonstrates a follicular pattern consistent with a thyroid neoplasm. Surgical resection is performed. NO capsular invasion is identified on histopathology. What is the most likely diagnosis for this patient's thyroid neoplasm?