INTRODUCTION — Central diabetes insipidus (CDI) is characterized by decreased release of antidiuretic hormone (ADH,
also called arginine vasopressin or AVP), resulting in a variable degree of polyuria. Lack of ADH can be caused by
disorders that act at one or more of the sites involved in ADH secretion: the hypothalamic osmoreceptors; the supraoptic
or paraventricular nuclei; or the superior portion of the supraopticohypophyseal tract [1]. By contrast, damage to the tract
below the median eminence or to the posterior pituitary generally causes only transient polyuria, because ADH produced in
the hypothalamus can still be secreted into the systemic circulation via the portal capillaries in the median eminence