: * * Pituitary injury - Posttraumatic, neurosurgical, hemorrhage, ischemia (Sheehan’s), idiopathic-autoimmune, lymphocytic hypophysitis, IgG4-related disease * * Tumors - Craniopharyngioma, pinealoma, meningioma, germinoma, lymphoma, metastatic disease, cysts * * Aneurysms - Particularly anterior communicating * * Inflammatory states and granulomatous disease - Acute meningitis/encephalitis (septo-optic dysplasia, germinoma) * * Vascular (anterior communicating artery aneurysm clipping/rupture) * * Others - Craniopharyngioma, pinealoma, Langerhans cell histiocytosis, neurosarcoidosis, head trauma, cytomegalovirus encephalitis Gestational diabetes insipidusIn this form of diabetes insipidus, AVP is rapidly degraded by a high circulating level of oxytocinase/vasopressinase