THE APPLICATION OF3.0T MRI FOR THE PREOPERATIVE STAGING AND EVALUATION OF RECTUM CANCER

Objective:To study the value of3.0T MRI for the Preoperative T Staging and Evaluation of Rectum Cancer.Methods:Thirty-two cases biopsy-proven rectal cancer underwent MR examination before surgery.Preoperative MRI T staging of rectal cancer and postoperative histopathologic T staging were compared.The accuracy of the MRI T staging were caculated.The involvement of mesorectal fascia and the curve distance between the lesion and the analmargin were observed and compared with that of operation and pathology.Results:(1)Accuracy of rectal cancer T staging of non-enhanced and enhanced MR imaging in all 32 cases reached81.25% and93.75%.(2)In evaluating the involvement of mesorectal fascia,two patients were overstepped by MRI.The curve distance between lesions and analmargins could be measured accurately on sagittal section of MR images in all cases.Conclusion:Combination of non-enhanced and enhanced MR imaging can provide accurate rectal cancer T staging.3.0T MR has significant values in evaluating the feasibility of TME(total mesorectal excision)in the patients with rectal cancer.