A 50-year-old woman has noted painless swelling of her neck for the past 3 weeks. On physical examination there is diffuse enlargement of her thyroid. Laboratory studies show an increased titer of anti-thyroid peroxidase and anti-thyroglobulin antibodies. Within a month, the swelling has diminished. Which of the following complications is she most likely to develop?
Hypothyriodism
Amyloidosis
Papillary Carcinoma
Riedal throiditis