Fig. 1

Clinical course. When the patient was diagnosed with a thyroid tumour, her TSH was under the detection limit, and her thyroid hormone levels were normal; she had subclinical thyrotoxicosis. Her thyroid hormones worsened gradually until 2 weeks before admission; however, thyrotoxicosis rapidly deteriorated in the last 2 weeks. She also had a high Tg level at the first visit, which peaked 2 months before admission and then decreased