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  • Title: 10 years of successful treatment with dextrothyroxine in a girl with TSH-induced hyperthyroidism.
    Author: Krawczynska H, Wojcik-Musialek K, Illig R.
    Journal: Horm Res; 1991; 35(5):213-6. PubMed ID: 1802825.
    Abstract:
    14 years ago, a 5.7-year-old healthy girl was treated with desiccated thyroid for a goiter and elevated TSH levels. The goiter disappeared and TSH levels were normalized. However, hyperthyroidism appeared. Without therapy, the goiter reappeared and hyperthyroidism aggravated. Based on hormone values, TSH-induced hyperthyroidism was diagnosed. After exclusion of neoplastic TSH secretion, treatment with dextrothyroxine (DT4) was initiated at age of 10 years and continued during the last 10 years (except for short periods). The girl became euthyroid, has no goiter and normal TSH values. Since thyrotrophs and peripheral tissues are probably normally sensitive to T4, we postulate that her hypothalamopituitary-thyroid control is operating on a higher set point level for T4.
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