Version July 2025
| Layer echogenicity | Anatomic structure |
| Lumen | Hypoechoic (fluid)/Hyperechoic (air) depending on content |
| Luminal hyperechoic layer | Echo-line between lumen and mucosa |
| Luminal hypoechoic layer | Mucosa |
| Hyperechoic layer | Submucosa |
| Hypoechoic layer | Muscularis propria |
| Hyperechoic layer | Serosa |
