Development of subclinical hyperthyroidism due to Graves' disease in a hypothyroid woman who had undergone hemithyroidectomy for adenomatous goiter and radiotherapy for nasopharyngeal cancer

Yoshinori Nakagawa, Kouki Mori, Saeko Hoshikawa, Hiroshi Ozaki, Sadayoshi Ito, Katsumi Yoshida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A variety of thyroid disorders develop following external radiation to head and neck cancers. Hypothyroidism is the most common clinical consequence of the radiotherapy and lifelong thyroid hormone replacement is required in many cases. Patients who received both hemithyroidectomy and the external radiation to the neck are at especially high risk for permanent hypothyroidism. Here we report an unusual case with radiation-induced hypothyroidism who had undergone hemithyroidectomy for adenomatous goiter 8 years before the radiotherapy for nasopharyngeal cancer and subclinical hyperthyroidism due to Graves' disease developed during thyroxine replacement therapy. Thus subclinical hyperthyroidism due to Graves' disease can develop in patients with radiation-induced hypothyroidism even if they have undergone hemithyroidectomy for thyroid nodules. Therefore careful and periodic evaluation of thyroid function is required even on adequate thyroxine replacement therapy.

Original languageEnglish
Pages (from-to)35-37
Number of pages3
Journalendocrine journal
Volume54
Issue number1
DOIs
Publication statusPublished - 2007

Keywords

  • Graves' disease
  • Hypothyroidism
  • Radiotherapy
  • Thyroidectomy

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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