（二）既反流又梗阻性巨输尿管所占病人不多，据报道膀胱输尿管反流的病人中有梗阻的约占2%。
O O O B-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis I-dis O O O O O O O O O O B-dis I-dis I-dis I-dis I-dis I-dis I-dis O O O O O O O O O O O O O