What is the diagnosis and appropriate management for a patient with hyponatremia (serum sodium 119 mEq/L), low serum osmolality 264 mOsm/kg, urine sodium 60 mEq/L, and urine osmolality 249 mOsm/kg?

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A patient has serum sodium 119 mmol/L, serum osmolality 264 mOsm/kg, urine sodium 60 mmol/L, and urine osmolality 250 mOsm/kg; what is the most likely diagnosis and appropriate initial management?

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