Fig. 7From: Contrast-enhanced ultrasound (CEUS) in Crohn’s disease: technique, image interpretation and clinical applicationsInner layer enhancement. a B-mode US shows a thickened and layered bowel loop. Anterior wall is between marks. b CEUS depicts intense enhancement of the inner and intermediate layer, with absence of enhancement in the muscularis propria (hypoechoic external layer) (*)Back to article page