Fig. 6From: Current imaging techniques for evaluation of fistula in ano: a review3D TRUS image of intersphincteric fistula (hypoechoic area marked by the yellow arrow) at mid anal canal level. Red arrow demonstrates the hypoechoic internal sphincter ring (imaging performed with BK medical 3D Endoanal USG transducer Type 2052 with Flex focus scanner Type 1202)Back to article page