Sonoenterology / Hydrosonography

Section of the ileum obtained from a patient with Crohn’s disease showing the mucosa (M), muscularis mucosae (MM), submucosa (SM) and muscularis propria (MP). (a) On the histological section a thickened MM (arrow) is seen (H&E). (b) On the ultrasonographic image the thickened MM is seen as two extra echo layers (arrows) where the first layer is echo-rich representing the interface echo between the lamina propria and MM and the second layer is echo-poor representing the remaining part of the MM.