Fig. 2From: Contrast-enhanced ultrasound (CEUS) in Crohn’s disease: technique, image interpretation and clinical applicationsA 42-year-old man with CD and extramural disease. a Longitudinal US scan depicts a blind-end hypoechoic tract (arrows) originating from the thickened intestinal wall that represents a fistula, penetrating the mesentery (*). The stratified appearance of the bowel is lost focally at the site of the penetrating ulcer. b Macroscopic view of a transverse section of the surgical specimen through a fistulous tract (arrows) in the mesentery (*). Note the hyperaemic and thickened serosa of the resected intestinal segmentBack to article page