Abstract
A 40-year-old housewife was referred to our hospital for evaluation of a thyrotoxic state. A month after rubella infection, she developed heat intolerance. Physical examination revealed a hard and non-tender goiter with no signs or symptoms of inflammation. Free thyroid hormones were high and TSH was undetectable. 123I-thyroidal uptake was suppressed. Antithyroglobulin and anti-microsomal antibodies were negative throughout the course. A serologic study revealed high levels of anti-rubella antibodies. After a month without any treatment, she became euthyroid. Free thyroid hormones and TSH gradually became normal and the antibodies to rubella decreased. 123I-thyroidal uptake increased. From the clinical course, the patient was diagnosed as having silent thyroiditis. We suggest that viral infection such as rubella could cause the development of silent thyroiditis.
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