Case presentation A 61-year-old healthy female was presented to the ED with a 1-month history of polydipsia followed by progressive general weakness. The patient had been evaluated at a local hospital for diabetes mellitus; however, the findings were unremarkable.
Physical examination Height: 150 cm Weight: 50 kg Cardiac and neurological examination: Normal Breast examination: Normal Laboratory examination Serum sodium: 152 mEq/L Serum potassium: 4.1 mEq/L Fasting blood glucose: 103 mg/dL HbA1c: 4.9% Liver and thyroid function tests: Normal Chest X-ray: Unremarkable Mammography: Normal Water deprivation test results (for the evaluation of diabetes insipidus) The patient was administered 5 units of aqueous vasopressin at 1 pm that markedly increased the urine osmolarity indicative of complete pituitary diabetes insipidus. Brain MRI (for the evaluation of any abnormality in the pituitary…
