患者男，70岁。半年前出现尿频、尿急、尿流缓慢、尿流中断和排尿不尽，无血尿。直肠指诊发现前列腺增大，质地硬，血清PSA为58ng/ml。TRUS检查发现前列腺体积增大，内部未见异常回声。为了进一步鉴别诊断，应该选择下列哪种检查方法：

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