Anal Fistula
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References:

1) Halligan S, Stoker J. Imaging of Fistula in Ano. Radiology 2006;239(1):18-33 [PDF]

2) Morris J, Spencer JA, Ambrose NS. MR Imaging Classification of Perianal Fistula.
Radiographics 2000;20:623-635
[PDF]

3) Bartram C, Buchanan G. Imaging anal fistula. Radiol Clin N Am 2003;443-457 [PDF]

4) Halligan S, Buchanan G. MR imaging of fistula-in-ano. European Journal of Radiology
2003;47:98-107
[PDF]

5) Sun MRM, Smith MP, Kane RA. Current Techniques in Imaging of Fistula in Ano:
Three-Dimensional Endocanal Ultrasound and Magnetic Resonance Imaging. Semin Ultrasound
CT MRI 2008;29:454-471
[PDF]

6) de Miguel Criado J, Garcia del Salto L, Fraga Rivas P. MR Imaging Evaluation of Perianal
Fistulas: Spectrum of Imaging Features. Radiographics 2012;32:175-194
[PDF]