Familial Isolated Thyrotropin Deficiency with Cretinism
- 4 November 1971
- journal article
- Published by Massachusetts Medical Society in The New England Journal of Medicine
- Vol. 285 (19), 1043-1048
- https://doi.org/10.1056/nejm197111042851902
Abstract
Two sisters with nongoitrous cretinism, offspring of a consanguineous marriage, were found to have isolated thyrotropin (TSH) deficiency. Growth hormone, ACTH and gonadotropin secretion were estimated as intact. Serum TSH determined by radioimmunoassay was undetectable while these patients were hypothyroid, whereas it was very high in seven control patients with cretinism. Recovery and dilution experiments, and a prolonged half-life of 131I-TSH in blood, excluded the presence of an inhibitor or accelerated degradation of endogenous TSH. No increase in serum TSH was observed after administration of thyroid hormone or antithyroid drug. Administration of synthetic thyrotropin-releasing hormone failed to stimulate a rise in serum TSH levels. The uptake of radioiodine by the thyroid gland was appreciably increased by exogenous TSH.Keywords
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