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비기능성 뇌하수체 종양에 연관된 항이뇨호르몬 분비이상 증후군
이준철 ( Jun Chul Lee ),권기현 ( Ki Hyun Kwon ),이인석 ( Ihn Suk Lee ),김윤정 ( Yun Jeung Kim ),정사라 ( Sa Rah Jeong ),김설영 ( Seul Young Kim ),구본정 ( Bon Jeong Ku ) 대한내과학회 2007 대한내과학회지 Vol.72 No.3
We present a case of severe hyponatremia in a 64-year-old man who had a pituitary tumor. He had nausea and recurrent vomiting with a severe headache, and was admitted to Chungnam National University Hospital for further evaluation. On physical examination, he was alert, and had bitemporal hemianopsia. There was no indication of dehydration or edema. Laboratory data showed a serum sodium level of 126 mEq/L, plasma osmolality of 259 mOsm/kg, and urinary osmolality of 544 mOsm/kg. The plasma argipressin level was 2.88 pg/mL, despite marked hyposmolality. Otherwise, pituitary function was normal. Brain magnetic resonance imaging showed a pituitary macroadenoma measuring 25×16×13 mm and no visible normal pituitary stalk or gland in the sella turcica. After the adenomectomy, the serum sodium level maintained normal without treatment. Histology showed the presence of a pituitary adenoma. These findings indicate that a non-functioning pituitary tumor may cause the exaggerated secretion of argipressin, resulting in inappropriate antidiuretic hormone syndrome. (Korean J Med 72:315-321, 2007)