Comparison of different magnetic resonance imaging sequences for assessment of fistula-in-ano

Figure 1 Two different patients imaged with both 2D (A and C) and 3D T2 turbo spin-echo (B and D) images. In most patients, such as a 30-year-old male with intersphincteric fistula (black arrows), depictions were clear on both 2D (A) and 3D (B). However, in the 39-year-old male depicted in images C and D, the fistula (white arrows) entering dorsally was noticed on 2D images (C), but not those that were 3D (D). Note that there is a seton partially visible inside the tract on the 2D image.