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Differential diagnosis between autoimmune thyrotoxicosis and thyroid hormone resistance syndrome: clinical case report

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We report a case of 50-year-old woman with thyroid hormone resistance syndrome. For 20 years this patient have been treated for autoimmune thyrotoxicosis: she underwent thyroid surgery and then was on thyroid-blocking therapy. Repeated laboratory tests demonstrated elevated serum thyroid hormones concentrations and elevated TSH concentration. Inappropriate TSH secretion became the reason for conducting further investigations. In those cases, the diagnostic approach is complicated and cases may be referred as a syndrome of thyroid hormones resistance or as a pituitary mass. Results of magnetic resonance imaging as well as results of octreotide test did not confirm TSH-producing pituitary adenoma. Lack of consistent thyrotoxicosis symptoms and normal level of biochemical markers that reflect peripheral tissue response to excessive thyroid hormones action were regarded as an evidence for thyroid hormones resistance syndrome. In cases of thyroid hormone resistance syndrome, there is no reduction in thyroid hormones after octreotide administration and we could observe it in our patient. Thereby clinical data and laboratory tests supported the diagnosis of thyroid hormone resistance syndrome. To establish definitive diagnosis and to verify genetic cause of the disease we performed direct sequencing of the THRB gene exons 9–10.

Natalya V. Mazurina

Endocrinology Research Centre

Author for correspondence.
Email: natalyamazurina@mail.ru
ORCID iD: 0000-0001-8077-9381
SPIN-code: 9067-3062

Russian Federation, 11, Dm. Ulyanova street, Moscow, 117036


Ekaterina A. Troshina

Endocrinology Research Centre

Email: troshina@inbox.ru
ORCID iD: 0000-0002-8520-8702
SPIN-code: 8821-8990

Russian Federation, 11, Dm. Ulyanova street, Moscow, 117036

MD, PhD, professor

Olga S. Chukhacheva

Endocrinology Research Centre

Email: ochukhacheva@gmail.com
ORCID iD: 0000-0001-5675-5419
SPIN-code: 3484-6222

Russian Federation, 11, Dm. Ulyanova street, Moscow, 117036


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Copyright (c) 2019 Mazurina N.V., Troshina E.A., Chukhacheva O.S.

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