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What is A 55-year-old woman who has a history of severe depression and had a radical mastectomy for carcinoma of breast one year back develops polyuria nocturia and excessive thirst - 
Laboratory values are as follows: Serum sodium 149 m Eq/L, Serum potassium 3.6 m Eq/L, Serum calcium 9.5 mg/dl, Glucose 110 mg.dl, Bun 30 mg/dl, Urine osmolarity 150 in Osm kg. The most likely clinical diagnosis would be - and explain in detail?
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