Fig. 10

MRI of uncomplicated perianal Crohn’s disease (CD). a, b in a 41-year-old, the ano-VF is seen as a midline fluid-filled track (thin arrows) coursing through the anovaginal septum to reach the lower third of the vagina (arrow) on sagittal (a) and FS axial (b) T2-weighted images. c, d in a 36-year-old with colonic CD, the ano-VF is initially seen as a thin midline tract (thin arrow) on axial FS T1-weighted image after gadolinium CM (c) that reaches the vagina (arrow). On infliximab, repeated MRI including sagittal FS T1-weighted image after gadolinium CM (d) shows positioning of a seton (thick arrow) through the ano-VF