Practice question

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A 35-year-old woman presents with palpitations, sweating, anxiety, and weight loss despite an increased appetite. On examination, she has a fine tremor, tachycardia (110 bpm), and a smooth diffuse goitre. TSH is suppressed (<0.01 mU/L) and Free T4 is elevated (35 pmol/L). TSH receptor antibodies (TRAb) are positive. What is the most likely diagnosis?

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