8岁男孩，脸面水肿月余，近一周来加剧，下肢为甚。血压16.8/12kPa(126/90mmHg),下肢水肿（++),尿蛋白(+++),RBC(+-++),血总蛋白4.9g/dl,白蛋白2.4g/dl，胆固醇250mg/dl。C3低于正常。最可能的临床诊断是

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