患者，男，70岁。排粪困难6个月，2次/ 周，有便意，伴排粪不尽感、腹胀，无腹 痛。査体：腹软，无压痛，未触及包块， 肝、脾未及，肠_音4次/分，肛门直肠指诊发现直肠中有泥样粪便。最需要进行的 检査是

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