男，72岁，排尿困难5年，近2个月加重，伴食欲不振。直肠指诊前列腺明显増大 5cm x 6cm，叩诊膀胱脐下3横指。血BUN 为36mmoI/L，Cr 为340umol/ml。B 超示双肾中度积水。下面哪一种治疗最为合理

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