A 29-year-old woman complains of insatiable thirst. When asked about her bathroom habits, she reports having to urinate 10–12 times per day without any decrease at night. Some preliminary lab work reveals an appreciably elevated serum osmolarity with mild elevations of various electrolytes. Conversely, her urine has a very low osmolarity and is negative for any glucose. She is given a trial injection of arginine vasopressin (AVP), and 2 hours later, her urine osmolarity returns to normal. Which of the following diagnoses best fits this patient?
Neurogenic diabetes insipidus
Adenohypophysea, tumor
Ectopic secretion of ADH
Psychological polydispsia
Diabetes mellitus