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      Autoimmune Thyroiditis with Transient Thyrotoxicosis: Comparison between Painful Thyroiditis and Painless Thyroiditis

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          Clinical and laboratory findings and long-term outcomes in 8 patients (7 women) with autoimmune thyroiditis (AT), aged 34–59 years, who had a painful tender goiter and a transient thyrotoxicosis with a low thyroid radioactive iodine uptake (RAIU), were compared with those in 15 patients (13 women) with painless thyroiditis (PT), aged 23–69 years. Six painful AT and 6 PT patients had a history of prior awareness of goiter. All patients with painful AT had a moderate or marked elevation of erythrocyte sedimentation rate and a positive result for C-reactive protein, while only 3 PT patients (group B) did. There were no significant differences between the mean age, duration of symptoms, white blood cell count, serum triiodothyronine (T<sub>3</sub>) and thyroxine (T<sub>4</sub>) concentrations, serum T3/T4 ratio and duration of thyrotoxicosis after the initial examination and prevalences of positive results for antithyroglobulin and -microsomal antibodies in the two diseases. Two of 8 painful AT patients showed a histologically chronic fibrous variant and 6 others showed chronic lymphocytic thyroiditis. All PT patients examined also showed lymphocytic thyroiditis. Two and 5 painful AT patients developed transient and persistent hypothyroidism, respectively, while 8 [7 in group A (normal ESR), 1 in group B] and 3 PT patients (1 in group A, 2 in group B) did, respectively. The mean serum thyroid-stimulating hormone level in the hypothyroid phase in painful AT patients was higher than that in PT patients. Thus, on the basis of AT, acute exacerbations of the immune aggression against the thyroid may occur which lead to transient thyrotoxicosis with a low RAIU and, according to the degree of immune phenomena, either to a painful or to a painless thyroid swelling.

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          Author and article information

          Horm Res Paediatr
          Hormone Research in Paediatrics
          S. Karger AG
          02 December 2008
          : 36
          : 1-2
          : 9-15
          First Department of Internal Medicine, Tottori University School of Medicine, Yonago, Japan
          182098 Horm Res 1991;36:9–15
          © 1991 S. Karger AG, Basel

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          Pages: 7
          Original Paper


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