A 33 year old lady present! with polydipsia and polyuria. Har symptoms staed soon after a road traffic accident 6 months ago. The blood pressure is 120/80 mm Hg with no postural drop. The daily urinary output Is 6-8 liters. Investigation showed, Na 130 mEq/L, KJ.5 mEq/L, urea 15mg/dL, sugar-65 mg/dL. The plasma osmolality is 268 mosmol/L and urine osmolatity 45 mosmol/L. The most likely diagnosis is-: (A) Central diabetes insipidus, (B) Nephrogenic diabetes insipidus, (C) Resolving acute tubular necrosis, (D) Psychogenic polydipsia
Answer is D. here there is no thirst and polydipsia due to psychosis ( Harrison 17 pg 2219)