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目的分析直肠癌各期在MRI上的表现，评估盆腔MRI检查在直肠癌术前T分期中的应用价值。方法对2013年9月~2014年4月手术治疗前30例直肠癌病例的盆腔MRI检查T分期结果与术后组织病理学结果对比，分析MRI对直肠癌术前T分期的准确率。结果 MRI对直肠癌(T分期)的诊断准确率为90%，MRI对T2和T3的诊断准确率分别为75%和100%。结论盆腔MRI检查能够较准确地判断直肠壁的浸润深度，MRI检查可作为直肠癌术前T分期的首选检查手段。“,”Objective To analyze MRI features of rectal cancer , and evaluate the application value of pelvic MRI examination in preoperative T staging of rectal cancer . Methods Compared the MRI on the preoperative T staging of 30 cases of rectal cancer with postoperative pathology between September 2014 and April 2013, and analyzed the accuracy of T staging of rectal cancer in MRI. Results The diagnostic accuracy of MRI for rectal cancer (T staging) was 90%, the diagnostic accuracy of T2 and T3 were 75% and 100%. Conclusion Pelvic MRI examination can determine the depth of invasion of the rectal wall ,MRI examination can be used as the first choice for T staging of rectal cancer.