Intense Pituitary 18F-Fluorodeoxyglucose Positron Emission Tomography Uptake in a Patient with Diabetes Insipidus

A 6-year-old male patient was presented with a two-month history of polyuria and polydipsia. The patient's 24-hour urine osmolality was 79 mOsm/kg and he lost 5.2% of his weight after 7-hour water deprivation test. His renal functions were normal, his polyuria and polydipsia resolved on treatment with 60 μg desmopressin…