MRI for Assessment of Anal Fistula


Saeed Naghibi 1 , *

1 Islamic Azad University

How to Cite: Naghibi S. MRI for Assessment of Anal Fistula, Iran J Radiol. Online ahead of Print ; 14(Special Issue):e47978. doi: 10.5812/iranjradiol.47978.


Iranian Journal of Radiology: 14 (Special Issue); e47978
Published Online: April 12, 2017
Article Type: Abstract
Received: December 20, 2016
Accepted: February 7, 2017


Abstract: A fistula-in-ano is the passage between the skin around the anus and anal canal that usually caused by a previous anorectal abscess and an obvious sign of that is continuous discharge. Although its not the common disease in GI tract but it has caused considerable morbidity. The outbreaks have almost 11 per 111, 111, and 2 - 4 times more frequent in men and if its not diagnosed and treated on time, it can be a high risk of recurrence and fecal incontinence and associated risk of sepsis and abscesses.

Objectives: The purpose of the study was to evaluate the role of Magnetic Resonance Imaging in detection and characterization of perianal fistulae and correlating it with surgical findings.

Methods: In this study, 14 patients with clinical and physical examination of perianal fistulas were prospectively selected for MRI evaluation, with specific MRI sequence T1W, T2W, T1 Fat Sat or T2 Fat Sat, T1 + contrast, etc,and with special coils plans axial, coronal, sagittal . MRI findings were recorded. The surgery was performed and the results were also recorded and eventually the consistency and effectiveness of MRI were compared with the results after surgery.

Results: Amongst the total of 14 patients,in 1 patient (7117) Transsphincteric fistula, 11 patients (78167) Intersphincteric fistula and 2 patients (14137) Suprasphincteric fistula were diagnosed and in surgery findings, 1 (7117) Transsphincteric fistula, 11 (71147) Intersphincteric fistula and 2 (14137) Suprasphincteric fistulas were detected and in one case no fistula was observed. An agreement between two detection methods was 82177 and sensitivity of MRI in the diagnosis of intersphincteric, transsphincteric and suprasphincteric fistulas were 1117 and the specificity was 757 in the detection and diagnosis of intersphincteric fistulas and 1117 for transsphincteric and suprasphincteric fistulas1

Conclusions: Based on the results of this study and according to the 1117 sensitivity of MRI, its useful to locate the perianal fistulas, reduce the chance of recurrence and postoperative complications and can contribute the healing process better than other diagnostic methods.

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