患儿女，8岁，自幼多尿、烦渴、多饮，近1〜2 年常诉腿痛。血 Na+132mmol/L，K+2.9mmol/L， CL-116mmol/L, Ca2+ 1.8mmol/L0血气分析: pH 7.22,HCO3 11.8mmol/L，SBE—8,尿 pH 6. 5, 镜检(-)。B超示双肾髓质区可见强回声团。最可能的诊断是

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