患者男，46岁。以间歇性无痛性全程肉眼血尿2周来院就诊，偶有血凝块，无尿频、尿急、尿痛症状。查体：无阳性体征发现。B超检查：双肾及输尿管正常，膀胱内发现 实质占位，大小2 . 5cm x2 . 5cm。目前首先要做的检查是

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