Fig. 5From: Current imaging techniques for evaluation of fistula in ano: a reviewCT fistulogram of a transsphincteric fistula in ano on the right perianal region with upper and lower arms and internal openings in both anterior and posterior midline. a Transverse image showing lower arm of the track entering into the anal canal posteriorly (yellow arrow) with contrast in the rectum (blue arrow). b Coronal image showing upper arm of the track entering into the anal canal anteriorlyBack to article page