患者，男性，60岁。既往有垂体瘤切除病史，未随访。近1周出现恶心、食欲下降、乏力。查体：神志淡漠，精神差，全身水肿，体温39℃，血压90/60mmHg，血肌酐89μmol/L，Na+123mmol/L，K+3.3mmol/L。.最可能的病因是

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