Evaluation of diagnostic accuracy of 3-D endoanal ultrasound in perianal fistula in comparison with intraoperative findings

Abstract

ObjectivePerianal fistula is a common and debilitating disease. The definite treatment is surgery, identifying of primary and secondary tract, internal opening of fistula has important role in planning of surgical techniques. This study's goal was to determine the diagnostic accuracy of 3-D ultrasound in perianal fistula in comparison with intraoperative findings. Materials and methodsThis study is a cross-sectional study. Adult patients (18–85 years old) with anal fistula have been selected. 3-D EUS was done for all patients by gastroenterologist. Then surgery was done. Check lists filled by endoscopist and surgeon was studied and data analysis was done. ResultsThe study examined 76 patients, in according to results for kappa coefficient there was a perfect agreement between 3-D ultrasound results and surgery in internal opening that was 96% (p<0.001) and concordance was 0.974. In extension tract the agreement was 0.973 and concordance was 0.987 (p<0.001). ConclusionThere was perfect agreement between 3-D ultrasound and surgical findings in internal opening, primary tract and trunk expansion. 3-D ultrasound shows a high diagnostic accuracy when compared with surgery to assessment of perianal fistula before surgery.