单选题：（共用备选答案）A．体外冲击波碎石B．经皮肾镜碎石C．经输尿管镜碎石D．腹腔镜下取石或开放性手术取石E．药物治疗及大量饮

题目内容：

（共用备选答案）
A．体外冲击波碎石
B．经皮肾镜碎石
C．经输尿管镜碎石
D．腹腔镜下取石或开放性手术取石
E．药物治疗及大量饮水
输尿管结石4mm。结石远端无梗阻，首选治疗方案是

参考答案：

答案解析：

Questions are based on the following passage. Baekeland and

Questions are based on the following passage. Baekeland and Hartmann report th

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