Abstract
Perianal fistulae are a relatively common condition. They are thought to be a result of anal gland obstruction, with secondary abscess formation and external rupture of the abscess. They have traditionally been imaged by conventional fistulograms: transrectal ultrasound and CT scan. However, each of these procedures had its own disadvantages & limitations. Until the recent past, magnetic resonance (MR) imaging had a limited role in the preoperative assessment of perianal fistulas, though the role of MR imaging has been shown to demonstrate accurately the anatomy of the perianal region. In addition to showing the anal sphincter mechanism, MR imaging clearly shows the relationship of fistulas to the pelvic diaphragm (levator plate) and the ischiorectal fossae. This relationship has important implications for surgical management.
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