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  • Title: Toxic multinodular goiter: a variant of autoimmune hyperthyroidism.
    Author: Kraiem Z, Glaser B, Yigla M, Pauker J, Sadeh O, Sheinfeld M.
    Journal: J Clin Endocrinol Metab; 1987 Oct; 65(4):659-64. PubMed ID: 2888784.
    Abstract:
    The aim of this study was to examine whether at least a subgroup of patients with toxic multinodular goiter may have autoimmune thyroid disease. Thyroid-stimulating immunoglobulin (TSI) activity, measured by a sensitive bioassay employing cultured human thyroid cells, was determined in patients with toxic multinodular goiter and other thyroid disorders. All patients with active Graves' disease (n = 47) had detectable serum TSI activity, whereas TSI was undetectable in patients with thyroid disease not believed to be of autoimmune origin: toxic adenoma (n = 13), cold nodule (n = 5), and nontoxic goiter (n = 19), with a single exception in the latter group. Toxic multinodular goiter (n = 26) was diagnosed based on clinical and laboratory evidence of hyperthyroidism associated with a multinodular goiter on palpation and scintiscan. The toxic multinodular goiter group was then subclassified according to scintiscan pattern (type A, diffuse but uneven distribution of technetium uptake; type B, multiple discrete nodules of varying size and function). All but 1 of the 11 TSI-positive toxic multinodular goiter patients had a type A scintiscan pattern. The patients with the type A scintiscan pattern were younger and more often had elevated antithyroid antibody titers, ophthalmopathy, and concurrent development of goiter and hyperthyroidism (rather than long-standing goiter preceding hyperthyroidism) compared to the type B patients. Thus, a subgroup of patients with clinically defined toxic multinodular goiter (type A) probably have autoimmune hyperthyroidism (a variant of Graves' disease), while in another subgroup (type B) hyperthyroidism is not related to an autoimmune etiology (a variant of toxic adenoma).
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