How to perform gastrointestinal ultrasound: Anatomy and normal findings

Figure 5 Typical complications in Crohn’s disease, fistula. Typical ultrasound findings in Crohn’s disease include transmural inflammation, fistula and abscess formation. A-C: The typical sign of fistula is hypoechoic transmural inflammation with (moving) air bubbles outside of the bowel lumen. The air bubbles are best visualised using a real-time examination or video. Here we demonstrate single images of a video to demonstrate the changes within one second.