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Figure 5: Magnetic resonance enteroclysis in a 21-year-old male with active Crohn's disease. (a) Coronal true-FISP and (b) half-Fourier acquisition single-shot turbo spin-echo imaging images show mucosal irregularity (arrows) as thin lines of high signal intensity, longitudinally or transversely (fissure ulcers) orientated within the thickened wall in the terminal ileum consistent with diffuse ulcerations in Crohn's ileitis; (c) an axial true-FISP sequence detects wall thickening of terminal ileum as well as the caecal wall (arrows); (d) an axial fat-suppressed T2-weighted half-Fourier acquisition single-shot turbo spin-echo imaging sequence MRI shows a high-signal-intensity bowel wall (arrows) and fluid surrounding the distal ileum (small arrow); and (e) coronal and (f) axial contrast T1-weighted gradient echo sequences with fat-saturated images showing marked contrast enhancement, with avid enhancement of the mucosa of the terminal ileum and caecal walls. Note the high-signal-intensity linear structure caused by increased vascularity (small arrows in [e]) close to the mesenteric border of the involved small bowel segment, the so-called comb sign. These MR findings are indicative of active Crohn's disease. Reproduced from Masselli.[3] This is an open access article distributed under the terms of the creative commons attribution license (http://creativecommons.org/licenses/by/3.0.), which permits others to distribute, remix, adapt and build up on this work, for commercial use, provided the original work is properly cited

Figure 5: Magnetic resonance enteroclysis in a 21-year-old male with active Crohn's disease. (a) Coronal true-FISP and (b) half-Fourier acquisition single-shot turbo spin-echo imaging images show mucosal irregularity (arrows) as thin lines of high signal intensity, longitudinally or transversely (fissure ulcers) orientated within the thickened wall in the terminal ileum consistent with diffuse ulcerations in Crohn's ileitis; (c) an axial true-FISP sequence detects wall thickening of terminal ileum as well as the caecal wall (arrows); (d) an axial fat-suppressed T2-weighted half-Fourier acquisition single-shot turbo spin-echo imaging sequence MRI shows a high-signal-intensity bowel wall (arrows) and fluid surrounding the distal ileum (small arrow); and (e) coronal and (f) axial contrast T1-weighted gradient echo sequences with fat-saturated images showing marked contrast enhancement, with avid enhancement of the mucosa of the terminal ileum and caecal walls. Note the high-signal-intensity linear structure caused by increased vascularity (small arrows in [e]) close to the mesenteric border of the involved small bowel segment, the so-called comb sign. These MR findings are indicative of active Crohn's disease. Reproduced from Masselli.<sup>[3]</sup> This is an open access article distributed under the terms of the creative commons attribution license (<a target=http://creativecommons.org/licenses/by/3.0.), which permits others to distribute, remix, adapt and build up on this work, for commercial use, provided the original work is properly cited">