• s/p trans-sphenoidal resection of mass • Acute Brain Injury • Hypoxemic insult/vascular injury • Neurosurgical procedures involving the brain • Meningitis • Congenital cysts / masses of the brain involving the hypothalamus, pituitary or infundibulum • Cranial tumors • Brain malformations • Patients with pre-existing diagnosis of central DI Exclusion Criteria: • Renal failure • Other多尿的原因不排除: