Fig. 13

MRI-like use of CT to investigate CD-related perianal inflammatory disease. In a 50-year-old, small-FOV axial (a) and oblique-coronal (b) CT reformatted images show peripherally enhancing abscess collection extending from the anovaginal septum (arrowheads) to the right levator ani muscle (*). Axial FS (c) and sagittal (d) T2-weighted, post-gadolinium FS axial (e) and sagittal (f) T1-weighted MRI images show same findings with fluid-filled abscess cavities with strong mural enhancement. Note severe proctitis as circumferential thickening of rectal walls with oedematous submucosa (in d) and marked homogeneous enhancement (in f)