Imaging Pelvimetry Influence On Preoperative Decision Of Laparoscopic Low Rectal Cancer Surgery

Objectives:Surgical resection remains the primary treatment modality for rectal cancer.Short-term and long-term patient outcomes are influenced by a multitude of factors following rectal cancer surgery.Rectal cancer surgery often has different surgical results because of individual differences and the doctor's experience.This study is designed to provide anatomical basis for laparoscopic surgery for low rectal cancer through the pelvic imaging data.Methods:Sixty-seven patients suffering from low rectal cancer had underwent laparoscopic surgery which were analayzed through retrospective study.They were divided into the anus and non-anus group.35 set of pelvic data was obtained from the preoperative CT three-dimensional reconstruction and MRI images.After that the discriminant function was obtained to predict the surgery methods for patients with low rectal carcinoma.Results:Anal sphincter group discriminant function(F1)=-33.698+6.045×anal margin distance(cm)+1.105×T4;non anal sphincter group discriminant function(F2)=-14.125+3.138×anal margin distance(cm)+0.804×T4.Discriminant function analysis is a statistical analysis to predict a categorical dependent variable(called a grouping variable)by one or more continuous or binary independent variables(called predictor variables).If F1 is greater than F2 then the case can be treated as the anus reservation while if F2 is greater than F1 the case cannot be treated anus reservation.The accuracy of the discriminant function was evaluated which was found to be 92.5%.Conclusion:Thus,the discriminant function of pelvic data provides anatomical basis for the choice of surgical methods for low rectal cancer.