林伟达 骆衍新

    [摘要] 目的 分析MRI在直肠癌术前分期中的准确性。 方法 选择2012年12月～2014年4月于中山大学附属第六医院接受MRI检查并通过活检组织病理确诊的原发性直肠癌患者154例，通过对比其术后病理分期，分析MRI术前分期准确率。 结果 将T分期分为T3～4期及T0～2期，其准确率、灵敏度、特异度、阳性预测值和阴性预测值分别为77.9%、93.3%、46%、78.2%和76.7%。而N分期分为N+期和N0期，分别是57.1%、78.2%、45.5%、44.3%和78.9%。TNM分期分为Ⅱ～Ⅲ期和0～Ⅰ期，分别是79.9%、93.1%、39.5%、82.4%和65.2%。 结论 MRI是一种准确的直肠癌术前分期方法，TN分期均具有较高的灵敏度，但是特异度不高，可能会导致过度分期。

    [关键词] 直肠癌；MRI；术前分期；准确性

    [中图分类号] R657.1 [文献标识码] A [文章编号] 1673-7210(2017)10(a)-0113-04

    [Abstract] Objective To evaluate the accuracy of preoperative MRI staging in primary rectal cancer patients. Methods From December 2012 to April 2014， in Sixth Affiliated Hospital of Sun Yat-Sen University， 154 primary rectal cancer patients underwent MRI before surgery were selected. The accuracy of preoperative MRI was analyzed by comparing with postoperative pathological stage. Results T stage was divided into T3-4 stage and T0-2 stage， the accuracy， sensitivity， specificity， PPV， NPV were 77.9%， 93.3%， 46%， 78.2%， 76.7%. N stage was divided into N+ stage and N0 stage ......