Fig. 6
From: Role of transperineal ultrasound in evaluation of patients with perianal inflammatory disorders
a 60Â years old male, with history of recurrent perianal fistula, presented with perianal pain and discharge. TPUS in oblique coronal plane (a) shows a left-sided perianal tract (long arrow), in oblique axial ultrasound image (b), such tract forms an anterior horseshoe collection (short arrows) from which two small side branches are noted emerge (arrowheads). In T2 coronal oblique MR image(c, e) and T2 oblique axial T2 image (d), the left-sided trans-sphincteric tract is seen (long arrow) forming an anterior horseshoe collection (short arrows) with two small side branches are noted (arrowheads in c, e)