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Hyperthyroidism following hypothyroidism--a case report.

A 25 year old female presented with hypothyroidism which was followed by the development of hyperthyroidism about 1 1/2 years later. This uncommon phenomenon is postulated to result from changes in the relative amounts of stimulatory and inhibitory TSH receptor antibodies. This case illustrates the possible continuum between Graves' disease and Hashimoto's thyroiditis within the broad spectrum of autoimmune thyroid disease.