Small-bowel MRI in children and young adults with Crohn disease: retrospective head-to-head comparison of contrast-enhanced and diffusion-weighted MRI

• Published in: Pediatric radiology 2013, Vol.43 (1), p.103-114
• Main Authors: Neubauer, Henning, Pabst, Thomas, Dick, Anke, Machann, Wolfram, Evangelista, Laura, Wirth, Clemens, Köstler, Herbert, Hahn, Dietbert, Beer, Meinrad
• Format: Article
• Language: English
• Subjects: Adolescent; Adult; Case-Control Studies; Child; Colonoscopy; Contrast Media; Crohn Disease - pathology; Diffusion Magnetic Resonance Imaging; Female; Humans; Imaging; Intestine, Small - pathology; Lymphatic Diseases - pathology; Magnetic Resonance Imaging - methods; Male; Medicine; Medicine & Public Health; Neuroradiology; Nuclear Medicine; Oncology; Original Article; Pediatrics; Radiology; Retrospective Studies; Ultrasound; Young Adult
• ISSN: 0301-0449; 1432-1998
• DOI: 10.1007/s00247-012-2492-1

Background Small-bowel MRI based on contrast-enhanced T1-weighted sequences has been challenged by diffusion-weighted imaging (DWI) for detection of inflammatory bowel lesions and complications in patients with Crohn disease. Objective To evaluate free-breathing DWI, as compared to contrast-enhanced MRI, in children, adolescents and young adults with Crohn disease. Materials and methods This retrospective study included 33 children and young adults with Crohn disease ages 17 ± 3 years (mean ± standard deviation) and 27 matched controls who underwent small-bowel MRI with contrast-enhanced T1-weighted sequences and DWI at 1.5 T. The detectability of Crohn manifestations was determined. Concurrent colonoscopy as reference was available in two-thirds of the children with Crohn disease. Results DWI and contrast-enhanced MRI correctly identified 32 and 31 patients, respectively. All 22 small-bowel lesions and all Crohn complications were detected. False-positive findings (two on DWI, one on contrast-enhanced MRI), compared to colonoscopy, were a result of large-bowel lumen collapse. Inflammatory wall thickening was comparable on DWI and contrast-enhanced MRI. DWI was superior to contrast-enhanced MRI for detection of lesions in 27% of the assessed bowel segments and equal to contrast-enhanced MRI in 71% of segments. Conclusion DWI facilitates fast, accurate and comprehensive workup in Crohn disease without the need for intravenous administration of contrast medium. Contrast-enhanced MRI is superior in terms of spatial resolution and multiplanar acquisition.