• Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, P. R. China;
SONG Bin, Email: cjr.songbin@vip.163.com
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Objective To summarize the current status and progress of MR imaging in field of rectal cancer.Methods The recent literatures on this topic were reviewed and analyzed, then the key information they provide was integrated.Results Besides its measurement of tumor height and length, the MR imaging was also significant in the preoperative assessments of tumor staging and prognostic factors such as the extramural vascular invasion (EMVI), circumferential resection margin (CRM), and perineural invasion (PNI). However, some drawbacks couldn’t be neglected. For instance, the conventional MR imaging was of limited use in discriminating T1, T2 and borderline T3 rectal cancer. The similar limitation applies to situation between T3 and T4a rectal cancer as well. And its performances in the N staging prior to and post-neoadjuvant chemoradiation therapy were just average. Currently the functional MR imaging like the diffusion weighted imaging (DWI), some relatively novel modalities such as the dynamic contrast enhanced MRI and chemical shift have served in the radiological diagnosis of the rectal cancer.Conclusions MR imaging is the most frequently used modality in preoperative assessment of rectal cancer. It can describe size and location of tumor, assist in tumor staging, and evaluate prognostic factors. And it is supposed to provide critical information on decision making and prognosis judging. Besides current value of conventional MR imaging in the field of rectal cancer, some innovative techniques have shown moderate potentials as well. Due to their promising future use, detection of new biomarkers regarding rectal cancer can be expected.

Citation: YUE Yufeng, JIANG Hanyu, HUANG Zixing, SONG Bin. Preoperative magnetic resonance imaging assessment of rectal cancer: an overview and update on recent advances. CHINESE JOURNAL OF BASES AND CLINICS IN GENERAL SURGERY, 2019, 26(9): 1116-1121. doi: 10.7507/1007-9424.201907096 Copy

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