High-resolution MR image signs of local infiltration in rectal cancer with its pathological T staging:a comparison study

Objective To evaluate the relationship between the MRI signs of local infiltration and pathological staging of rectal cancer.Methods One hundred and forty-eight cases of pathologically confirmed rectal cancer underwent MR scan before operation.High-resolution MR signs were analyzed and classified.Then the staging was made accordingly and compared with histopathological T staging.Results In 148 cases,the overall diagnostic accuracy of T staging was 90.54%,MRI diagnostic accuracy of T1-T4 staging was 98.65%,91.22%,91.89% and 99.32%,respectively.The relationship between circumference invasion of rectal cancer and the pathological T staging was ordinarily positive(rs=0.59,P0.001)as well as between the MR signs of local invasion and pathological T staging(rs=0.62,P0.001).Conclusion High-resolution MRI for the rectal cancer staging has higher diagnostic accuracy and contributes to determine the treatment protocol.Correct identification of MR signs and the evaluation of the extent of the circumference invasions of rectal cancer are conductive to the T staging of rectal cancer.