患儿男，7岁，多饮、多尿近6个月。查体：生长发育落后，皮肤干燥、苍白。血渗透压298mmol/L,血钠145mmol/L，尿比重小于1.005。头颅MRI示蝶鞍处可见lcmxlcmx1.5cm大小占位影，该患儿最可能的诊断是

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