Preoperative staging of colorectal carcinoma:Comparison of MSCT and MRI

Objective To evaluate the diagnositic value of the MSCT and MRI in preoperative staging of colorectal carcinoma in comparison with pathological findings.Methods Totally 53 patients with histopathologically proven colorectal carcinoma were included.Plain and contrast scanning were performed with a row CT scanner and a 1.5 Tesla Simens Avanto unit.Results The sensitivity of MR for T1-2 was superior to MSCT(P0.05),but the difference was not statistically significant for T3,T4 stages(P0.05).The overall accuracy of MSCT,routine MRI and DWI in the definition of the involved lymph node was 56.60%,58.49% and 73.58%,respectively.DWI had medium relationship with pathologic results,Kappa value was 13.927(P=0.001).No statistical relationship of MSCT,routine MRI and pathologic results was found(Kappa=1.128,P=0.288;Kappa=1.585,P=0.208).Conclusion MRI is better than MSCT in preoperative staging of colorectal carcinoma.DWI is more accurately than MSCT and routine MRI for definition of the involved lymph node in patients with colorectal carcinoma.