Thyrotropin-producing microadenoma associated with pituitary resistance to thyroid hormone

Kenji Watanabe, Toru Kameya, Akira Yamauchi, Naohito Yamamoto, Akira Kuwayama, Izumi Takei, Hiroshi Maruyama, Takao Saruta

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


A 21-yr-old female with hyperthyroidism is described. Though her serum-free T3 was 17.8 pmol/L and free T4 was 60.2 pmol/L, TSH was as high as 10.7 mU/L. TRH stimulated an increase in TSH from 10.7-91.7 mU/L. T3 administration in gradually increasing doses of 100, 200, and 400 mg/day resulted in gradual reduction in serum TSH. Cranial computed tomography and magnetic resonance imaging revealed a microadenoma of the pituitary gland. Histology of the surgical specimen showed a TSH-producing adenoma with TSH cell cluster islets and decreased numbers of TSH cells in the nonneoplastic pituitary. Cultured cells from the adenoma secreted TSH spontaneously and in response to TRH. This TRH-stimulated TSH secretion was suppressed by T3 in a dose-dependent manner. One year postoperatively, neither residual tumor nor recurrence were seen by computed tomography and magnetic resonance imaging. However TSH, as well as free T3 or T4, was still high and overresponsive to TRH.

Original languageEnglish
Pages (from-to)1025-1030
Number of pages6
JournalJournal of Clinical Endocrinology and Metabolism
Issue number4
Publication statusPublished - 1993 Apr
Externally publishedYes

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical


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