A 34-year-old woman comes to the office due to a 1 week history of mood swings, difficulty concentrating, and hand tremors. She also has pain at the front of her neck that radiates to her ears and is worse with swallowing, following a flu-like illness a few weeks earlier. Blood pressure is 140/80 mm Hg and pulse is 105/min. The thyroid gland is very tender on palpation. A thyroid scan reveals diffusely decreased radioiodine uptake. Erythrocyte sedimentation rate is 105 mm/hr. Which of the following pathological changes would be most likely on biopsy of this patient's thyroid gland?
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