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| Definition | |
| Sludge | Layered, cloud shaped, mobile echoic bile duct content, without acoustic shadowing |
| Microlithiasis | Hyperechoic circumscript bile duct content, < 3 mm with or without acoustic shadowing |
| Stone(s) | Hyperechoic circumscript bile duct content, ≥ 3 mm with or without acoustic shadowing |
