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International Journal of Recent Trends in Science and Technology, ISSN 2277-2812 E-ISSN: 2249-8109

Volume 16, Issue 2, Sept 2015 pp 240-245

Research Article

Magnetic resonance imaging of perianal fistula

Lenon Jason D’Souza1, Ram ShenoyBasti2, H B Suresh3

1Resident, 2Associate Professor, 3Professor, Department of Radio diagnosis, Father Muller Medical College, Karnataka, INDIA.

Introduction: Perianal fistula is a cause of morbidity that is prolonged and recurrent if surgical excision is incomplete. Good preoperative assessment of the fistula is the only solution to ensure best post operative outcome. MRI is the gold standard imaging of choice for perianal fistula and therefore this study aims to prove the usefulness of different MR sequences in delineating the primary tract and complications of a perianal fistula and classifying the same. Materials and Methods: Retrospective analysis of MRI of 20 patients with perianal fistula who underwent surgery as the primary treatment modality were included.MRI was analyzed with the reader blinded to the surgical findings which was considered as the gold standard. Results and Conclusion: Our study showed that the MRI classification showed excellent agreement with the surgical finding. Post contrast T1W sequence is the most useful and accurate sequence to delineate the internal opening, its distance from the anal verge as well as secondary tracts. Horse shoe component is best seen on T1W post contrast as well as Precontrast T1W images. Abscess is well seen on all sequences.