MAGNETIC-RESONANCE-IMAGING OF FISTULA-IN-ANO

PURPOSE: Successful management of anal fistulas depends upon accurate assessment of the primary tract and any secondary extensions. Preopera tive imaging has, to date, been disappointing. METHODS: A prospective study of 35 patients with a clinical diagnosis of fistula-in-ano was p erformed comparing magnetic resonance imaging with the independently d ocumented operative findings. Magnetic resonance imaging was also comp ared with anal endosonography in 20 patients. RESULTS: Magnetic resona nce imaging is accurate and demonstrates pathology missed at surgery b y experienced coloproctologists. Magnetic resonance imaging is superio r to anal endosonography. CONCLUSIONS: Magnetic resonance imaging is a dvocated as the method of choice when imaging is required for anal fis tulas.