Fig. 4From: MRI for assessment of anal fistulaComplex fistula with both inter-sphincteric and trans-sphincteric components. An axial T2-weighted and three consecutive thin slice (1 mm) T1-weighted images with fat-saturation after gadolinium contrast. Images show inter-sphincteric fistula (white arrows). There is a thin communicating fistula stretching in the inter-sphincteric plane (thin hatched arrow), going through the external sphincter to reach the fistula lying outside the external sphincter (dotted arrow)Back to article page