Abstract
Intestinal ultrasound (IUS) has gained popularity as a first line technique for the diagnosis and monitoring of patients with inflammatory bowel diseases (IBD) due to its many advantages. It is a non-invasive imaging technique with non-ionizing radiation exposure. It can be easily performed not only by radiologists but also by trained gastroenterologists at outpatient clinics. In addition, the cost of IUS equipment is low when compared with other imaging techniques. IUS is an accurate technique to detect inflammatory lesions and complications in the bowel in patients with suspected or already known Crohn’s disease (CD). Recent evidence indicates that IUS is a convenient and accurate technique to assess extension and activity in the colon in patients with ulcerative colitis (UC), and can be a non-invasive alternative to endoscopy. In patients with IBD, several non-specific pathological ultrasonographic signs can be identified: bowel wall thickening, alteration of the bowel wall echo-pattern, loss of bowel stratification, increased vascularization, decreased bowel peristalsis, fibro-fatty proliferation, enlarged lymph nodes, and/or abdominal free fluid. Considering the transmural CD inflammation, CD complications such as presence of strictures, fistulae, or abscesses can be detected. In patients with UC, where inflammation is limited to mucosa, luminal inflammatory ultrasonographic changes are similar to those of CD. As the technique is related to the operator’s experience, adequate IUS training, performance in daily practice, and a generalized use of standardized parameters will help to increase its reproducibility.
Highlights
Introduction colonoscopy is the modality of choice to assess disease activity of patients with inflammatory bowel diseases (IBD), intestinal ultrasound (IUS) may be used as an alternative to evaluate disease activity, providing relevant additional information related to the extension and presence of complications in patients with Crohn’s disease (CD) [1]
The bowel wall layers are, from the bowel lumen: [2] (a) the mucosal layer, which is the interface between the mucosa and the bowel lumen; (b) the deep mucosa, which has a variable thickness and represents the packed glandular tissue; (c) the submucosa, which contains connective tissue with vessels, nerves, and fat; (d) the muscularis propria, with an inner circular muscle layer and an outer longitudinal muscle layer; and (e) the serosa, which is the visceral peritoneum
Waiting for further scientific evidence, the association of the basic IUS examination and Doppler with SICUS, Contrast-enhanced ultrasonography (CEUS), and/or elastography may increase the accuracy of IUS in detecting and characterizing CD strictures in clinical practice
Summary
Colonoscopy is the modality of choice to assess disease activity of patients with inflammatory bowel diseases (IBD), intestinal ultrasound (IUS) may be used as an alternative to evaluate disease activity, providing relevant additional information related to the extension and presence of complications in patients with Crohn’s disease (CD) [1].
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