Rectal imaging: part 2, Perianal fistula evaluation on pelvic MRI--what the radiologist needs to know.
OBJECTIVE
The purpose of this article is to provide an overview of pelvic MRI for the evaluation of perianal fistulas, with a description of the technique, illustration of relevant normal anatomy, and examples of various fistula types.


CONCLUSIONS
MRI evaluation of perianal fistulas can be challenging, and knowledge of relevant pelvic anatomy and fistula classification remains crucial in the diagnosis. MRI is highly accurate for fistula depiction and, by providing an accurate assessment of disease status and extension, can help surgical planning to minimize recurrence and detect clinically unapparent disease.
Department of Radiology, University of Michigan, University Hospital, 1500 E Medical Center Dr, B1-D502F, Ann Arbor, MI 48109, USA.
Ryan B
RB
O'Malley
Mahmoud M
MM
Al-Hawary
Ravi K
RK
Kaza
Ashish P
AP
Wasnik
Peter S
PS
Liu
Hero K
HK
Hussain
D000328:Adult; D001003:Anal Canal / Q000033:anatomy & histology / Q000473:pathology; D003424:Crohn Disease / Q000150:complications; D005260:Female; D006801:Humans; D007413:Intestinal Mucosa / Q000473:pathology; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D012003:Rectal Fistula / Q000145:classification / Q000150:complications / Q000175:diagnosis* / Q000601:surgery