A patient presents with frequent urination, nocturia, and enuresis. 24-hour urine volume was measured and recorded to be 7 litres. The urine osmolarity was 260 mOsm/L. ADH assay was performed and the recorded values were reported as 0.8 pg/ml. An MRI of the brain was performed and T1 weighted indicated the absence of the bright spot. What is the most likely diagnosis?

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