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We describe three cases of central diabetes insipidus,each with a different pathogenesis,in which unexpected hyperintensity of the posterior pituitary gland was seen on T1-weighted MR images obtained at the time of presentation.In the first case(idiopathic),the posterior pituitary signal persisted more than 10 years;in the second case(Langerhans cell histiocytosis),the signal disappeared within 3 months,despite early specific chemotherapy with etoposide;and in the third case(transient),the posterior signal disappeared within 1 year,but it was documented at the time of spontaneous reversal of polyuria and polydipsia. |
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