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Review Question - QID 215105

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QID 215105 (Type "215105" in App Search)
A 28-year-old woman presents 3 months after a radioactive iodine ablation for treatment of hyperthyroidism. She reports that she now feels lethargic and cold. Her temperature is 97.0°F (36.1°C), blood pressure is 105/78 mmHg, pulse is 55/min, and respirations are 12/min. On exam, she is tired appearing with delayed patellar and Achilles reflexes. Laboratory evaluation reveals:

Thyroid-stimulating hormone (TSH): 7.6 mU/L
Free thyroxine (T4): 0.1 ng/dL

She is started on levothyroxine replacement therapy. Which of the following was the most likely original hyperthyroid etiology that prompted her to undergo radioactive iodine ablation?