Background Central diabetes insipidus may be familial, secondaryto hypothalamic or pituitary disorders, or idiopathic. Idiopathiccentral diabetes insipidus is characterized by selective hypofunctionof the hypothalamic-neurohypophysial system, but its cause isunknown.
Methods We studied 17 patients with idiopathic diabetes insipidus,in whom the duration of the disorder ranged from 2 months to20 years. Only four patients had been treated with vasopressinbefore the study began. All the patients underwent endocrinologicstudies and magnetic resonance imaging (MRI) with a 1.5-T superconductingunit, and two patients had biopsies of the neurohypophysis orthe pituitary stalk.
Results Nine of the 17 patients had thickening of the pituitarystalk, enlargement of the neurohypophysis, or both and lackedthe hyperintense signal of the normal neurohypophysis. In theremaining eight patients, the pituitary stalk and the neurohypophysiswere normal, although the hyperintense signal was absent. Theabnormalities of thickening and enlargement were seen on MRIonly in the patients who had had diabetes insipidus for lessthan two years, and the abnormalities disappeared during follow-up,suggesting a self-limited process. In addition to vasopressindeficiency, two patients had mild hyperprolactinemia and ninehad impaired secretory responses of growth hormone to insulin-inducedhypoglycemia. The two biopsies revealed chronic inflammation,with infiltration of lymphocytes (mainly T lymphocytes) andplasma cells.
Conclusions Diabetes insipidus can be caused by lymphocyticinfundibuloneurohypophysitis, which can be detected by MRI.The natural course of the disorder is self-limited.
Source Information
From the Departments of Medicine (H.I., K.N., A.S., Y.O., T.S.) and Radiology (I.F.), Kyoto University Faculty of Medicine, and the Laboratory of Anatomical Pathology, Kyoto University Hospital (H.Y.), both in Kyoto, Japan.
Address reprint requests to Dr. Imura at Kyoto University, Kyoto 606-01, Japan.
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