Comparison of MRI and endorectal ultrasonography in diagnosis of rectovaginal fistula / 中国医学影像技术

ABSTRACT

Objective: To compare the value of MRI and endorectal ultrasonography (ERUS) in diagnosis of rectovaginal fistula (RVF). Methods: Data of 51 patients with suspected RVF who underwent preoperative MRI and ERUS were retrospectively analyzed. Then all RVFs were classified according to the cause and complexity, respectively. Taken surgical operation outcomes as standards, the sensitivity, specificity and accuracy of MRI and ERUS in diagnosis of RVF were evaluated, and the detection rate of MRI and ERUS for various types of RVF were compared and analyzed. The consistency of MRI and ERUS diagnosis results with surgical results, also between MRI and ERUS diagnosis results were analyzed. Results: RVF were confirmed in 40 cases with surgical operation. No statistical difference of the sensitivity, specificity and accuracy of MRI (85.00%, 90.90%, 86.27%) nor ERUS (80.00%, 100%, 84.31%) with surgical operation was found (χ2=0.17, 0.05).Strong consistency of MRI and ERUS diagnostic results were found with surgical diagnosis (Kappa=0.65, 0.63, both P0.05). Conclusion: Both MRI and ERUS can be used to diagnose RVF. ERUS is recommended as the preferred examination for simple RVF, while the combination of MRI and ERUS can improve the detection rate of complex RVF.