Application Of Multi-slice Spiral CT On The Imaging Staging Of Colorectal Cancer And Its Pathological Control Study

Objective To investigate the value of MSCT in the diagnosis of TNM staging of colorectal cancer.Methods a total of 80 patients with colorectal canecr who had radicl surgey in our hospital and underwent abdominal enhanced CT examination before operation.The infiltration depth,lymph node and distant metastasis were retrospectively reviewed and combined with pathological and clinical staging,analysed by SPSS 17.0 software.Results 1.The position on CT was consistent with postoperative pathology in all cases.In stage T1,the low-density band of the intestinal wall was intact on the enhanced CT,and the T2 stage showed the involvement of the moderate-density myometrial tissue,but it did not reach the full layer of the intestinal wall after the enhancement,and the serosal surface was smooth.In stage T3,the tumor was enhanced to reach the whole layer of the intestinal wall,and in the T4 stage,the serosal surface was irregular and the fat gap density was increased.The total diagnostic accuracy of MSCT was 86.2%.Kappa consistency test was compared with postoperative pathological T stage.The Kappa value was 0.783,indicating the consistency between the preoperative MSCT T staging and postoperative pathological staging was strong.The McNemar chi-square test showed that the?~2 value was 0.200,P>0.05,there was no significant difference.2.29 cases were staged as N0,26 were staged as N1,and 25 were staged as N2.The total accuracy of MSCT was 71.2%.Compared with postoperative pathological N stage,the Kappa consistency test showed a Kappa value of0.565.The McNemar-Bowker chi-square test showed a?~2 value of 8.491,P<0.05,indicating the consistency between the preoperative MSCT N staging and postoperative pathological staging was not very strong.3.69 cases were staged as M0,11 were staged as M1.Kappa value was 0.821,and the consistency between the preoperative MSCT T staging and postoperative pathological staging was good.The total accuracy of MSCT was 96.2%.Conclusion Whether the lesion breaks through the low-density zone is the identification sign for the identification of stage T1 and T2.And the enhanced mass reaching the whole wall of the tube wall or not is the identification sign of stage T2 and T3.The tumor of T4 stage shows that the serosal surface is not smooth,and the surrounding fat gap is seen as cord-like or nodular increased density.Compared with postoperative pathological staging,the consistency between the preoperative MSCT T staging was strong,between the N staging was general,and between the M staging was good for colorectal cancer,it can effectively stage colorectal cancer.