患者男性，31岁，尿频、尿急、尿痛3年。检 查：贫血貌，尿沉渣脓细胞（+ + + +)，红 细胞(+ + )，血尿素氮30mmol/L，排泄性尿 路造影两肾未显影，膀胱容量30ml左右。病因学诊断首先选择

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