title: Hyponatremia after thyroid hormone withdrawal in a patient with papillary thyroid carcinoma.
abstract: Hyponatremia is an electrolyte abnormality commonly found in clinical practice. It is important to diagnose the underlying etiology of the hyponatremia and correct it appropriately because severe hyponatremia can cause serious complications and substantially increase the risk of mortality. Although hypothyroidism is known to be a cause of hyponatremia, it is rare that hyponatremia occurs in relation to hypothyroidism induced by thyroid hormone withdrawal in patients with differentiated thyroid cancer. We report a case of a 76-year-old woman with papillary thyroid carcinoma presenting with severe hyponatremia related to hypothyroidism induced by thyroid hormone withdrawal for radio-active iodine whole-body scanning, who was treated by thyroid hormone replacement and hydration. Considering that the incidence of differentiated thyroid cancer is rapidly increasing, physicians should be aware that, although uncommon, hyponatremia can occur in patients undergoing radioiodine therapy or diagnostic testing.
authors.affiliation: Department of Internal Medicine, Bundang Jesaeng Hospital, Kwandong University College of Medicine, Seongnam, Korea.
authors.forename: Hyo Jin
authors.initials: HJ
authors.lastname: Jo
authors.affiliation: Department of Internal Medicine, Bundang Jesaeng Hospital, Kwandong University College of Medicine, Seongnam, Korea.
authors.forename: Yong Hyun
authors.initials: YH
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Bundang Jesaeng Hospital, Kwandong University College of Medicine, Seongnam, Korea.
authors.forename: Dong Hyun
authors.initials: DH
authors.lastname: Shin
authors.affiliation: Department of Internal Medicine, Bundang Jesaeng Hospital, Kwandong University College of Medicine, Seongnam, Korea.
authors.forename: Mi Jeoung
authors.initials: MJ
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Bundang Jesaeng Hospital, Kwandong University College of Medicine, Seongnam, Korea.
authors.forename: Sang Jin
authors.initials: SJ
authors.lastname: Lee
authors.affiliation: Department of Internal Medicine, Bundang Jesaeng Hospital, Kwandong University College of Medicine, Seongnam, Korea.
authors.forename: Dong Ok
authors.initials: DO
authors.lastname: Jeon
authors.affiliation: Department of Internal Medicine, Bundang Jesaeng Hospital, Kwandong University College of Medicine, Seongnam, Korea.
authors.forename: Sung Gyu
authors.initials: SG
authors.lastname: Im
authors.affiliation: Department of Internal Medicine, Bundang Jesaeng Hospital, Kwandong University College of Medicine, Seongnam, Korea.
authors.forename: Sun Kyung
authors.initials: SK
authors.lastname: Jang
authors.affiliation: Department of Internal Medicine, Bundang Jesaeng Hospital, Kwandong University College of Medicine, Seongnam, Korea.
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Choi
keywords: Hyponatremia; Hypothyroidism; Thyroid neoplasms
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