Imaging of the small bowel: Crohn’s disease in paediatric patients

Figure 3 Transversal (A) and longitudinal (B) section of a thickened ileal loop due to Crohn’s disease. The “target” sign, corresponding to remarkable bowel wall thickness, is visible as a strong echogenic centre surrounded by a hypoechoic border (A). The adjacent mesentery is thickened and hyperechoic, due to the transmural nature of inflammation in Crohn’s disease (A and B).