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[Hyperthyroidism caused by inadequate TSH secretion]

R Zass1, U Steindor, U Wendel

  • 1Universitäts-Kinderklinik Düsseldorf.

Monatsschrift Kinderheilkunde : Organ Der Deutschen Gesellschaft Fur Kinderheilkunde
|February 1, 1993
PubMed
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A rare case of inappropriate thyrotropin secretion in a child with hyperthyroidism was treated. 3,5,3'-triiodothyroacetic acid (TRIAC) successfully achieved remission, normalizing thyroid hormone levels and TSH.

Area of Science:

  • Pediatric Endocrinology
  • Thyroid Disorders
  • Hormone Secretion

Background:

  • Inappropriate thyrotropin secretion (ITS) is a rare condition characterized by normal or elevated TSH levels despite hyperthyroidism.
  • Diagnosis and management can be challenging, particularly in pediatric patients.

Observation:

  • A previously healthy 11-year-old girl presented with clinical hyperthyroidism and elevated thyroid hormones, but a normal TSH level.
  • Initial treatments including bromocriptine, dexamethasone, and D-thyroxine were ineffective.
  • Methimazole normalized thyroid hormones but paradoxically increased TSH and caused thyroid enlargement.

Findings:

  • Administration of 3,5,3 -triiodothyroacetic acid (TRIAC) effectively lowered TSH levels.
  • Long-term remission of hyperthyroidism was achieved with TRIAC therapy.

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Implications:

  • TRIAC may be a viable therapeutic option for specific cases of pediatric hyperthyroidism unresponsive to conventional treatments.
  • This case highlights the complex interplay of thyroid hormone regulation and TSH feedback mechanisms.
  • Further research into TRIAC's efficacy and safety in pediatric endocrine disorders is warranted.