Small bowel Crohn's disease: optimal modality for diagnosis and monitoring.

Abstract

This paper reviews different imaging options for small bowel (SB) Crohn's disease (CD) patients. In total, 80% of patients suffering from CD have SB involvement, being the exclusive manifestation in 30% of cases. As the proximal disease is related to poor response to treatment, a higher rate of stenosis and a greater need for surgical treatment, a SB assessment should be performed. This evaluation should be done not only once the disease has been diagnosed but periodically. The former to determine the extent of the disease, and the latter according to a treat-to-target strategy. Available techniques such as magnetic resonance imaging, intestinal ultrasound and capsule endoscopy (CE) have shown good accuracy parameters in CD patients. Cross-sectional studies are superior for penetrating and stricturing disease, whereas CE is excellent for proximal involvement and mucosal healing. Local expertise and availability may lead the election between techniques, nevertheless, they should not be considered as competitors but as complementary tools. SB involvement in CD patients is frequent and related to poorer outcomes. Hence, SB evaluation should be screened after diagnosis and routinely during the follow-up.