Qualitative sonographic assessment of transmural ileal inflammation in Crohn's disease: a comparison with MRI activity score.

Background: Intestinal ultrasound (IUS) is an accurate tool for monitoring Crohn's disease. To date, there is no clinically used validated quantitative ultrasonographic score for assessing disease activity. For magnetic resonance enterography (MRE), the magnetic resonance index of activity (MaRIA) is most used.