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Question category: Endocrinology

A 68 year old male has been suffering from a cough productive of green sputum and shortness of breath He is brought to A and E drowsy and confused. He is found to have a sodium of 115 mmol/L, normal renal function, with a plasma osmolality of 260 mOsmol/kg and urine osmolality of 500 mOsm/kg and urinary sodium of 145 mmol/L. What is the most likely cause of the hyponatraemia?

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