Abstract
A 68-year-old woman with Sjögren's syndrome simultaneously experienced thyrotoxicosis with a marked depression of thyroid radioactive iodine uptake and systemic lupus erythematosus-like symptoms, which both resolved spontaneously. Titers of antinuclear antibody and anti-DNA antibody were most elevated when the thyrotoxicosis and systemic lupus erythematosus-like symptoms coexisted and thereafter gradually declined in response to the decrease of titers of antithyroglobulin hemagglutination antibody and antimicrosomal hemagglutination antibody. To our knowledge, no such case has been previously reported. These observations strongly suggest that thyrotoxicosis in silent thyroiditis may be induced by an autoimmune mechanism.
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