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Magnetic resonance imaging of fistula-in-ano
P J Lunniss1, P G Barker, A H Sultan
1Department of Surgery, St. Mark's Hospitals, London, United Kingdom.
Purpose:
Successful management of anal fistulas depends upon accurate assessment of the primary tract and any secondary extensions. Preoperative imaging has, to date, been disappointing.
Methods:
A prospective study of 35 patients with a clinical diagnosis of fistula-in-ano was performed comparing magnetic resonance imaging with the independently documented operative findings. Magnetic resonance imaging was also compared with anal endosonography in 20 patients.
Results:
Magnetic resonance imaging is accurate and demonstrates pathology missed at surgery by experienced coloproctologists. Magnetic resonance imaging is superior to anal endosonography.
Conclusions:
Magnetic resonance imaging is advocated as the method of choice when imaging is required for anal fistulas.