期刊
ENDOCRINE JOURNAL
卷 48, 期 2, 页码 139-142出版社
JAPAN ENDOCRINE SOCIETY
DOI: 10.1507/endocrj.48.139
关键词
subacute thyroiditis; TSH receptor antibody; autoimmune thyroid disease
A 45 year-old man had a typical episode of subacute thyroiditis with tender goiter, depressed radioiodine uptake (RAIU) and elevated erythrocyte sedimentation rate. The titer of TSH binding inhibitor immunoglobulin (TBII), which had been 8.6% at initial presentation, rose to 14.9% in 2 weeks. TBII consisted of high titers (94%) of TSH stimulation-blocking antibodies (TBAb) and negative thyroid stimulating antibodies (TSAb). About 2 months after the first visit, TBII titers had risen to 48.9% and were persistently elevated for 5 months with high TBAb activity. The patient developed hypothyroidism with a maximum serum TSH level of 53.5 muU/ml. TBII and TBAb titers then gradually decreased, and the patient spontaneously recovered from hypothyroidism. Eighteen months after the episode of subacute thyroiditis, he became hyperthyroid with elevated TSAb and negative TBAb values. Doppler ultrasonography showed increased blood flow in the thyroid, and RAIU at 24 h was 53%. He was treated :vith antithyroid drugs, and soon became euthyroid. This case indicates that subacute thyroiditis can induce thyroid autoimmunity, and that the character of TSH receptor antibodies (TSHRAb) in these patients can change thereby modifying their thyroid function.
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