Target sign (choledocholithiasis)

Target sign
(choledocholithiasis) • Choledocholithiasis causing intrahepatic biliary duct dilation - Ganzer Fall bei Radiopaedia
Thapa, S. Choledocholithiasis causing intrahepatic biliary duct dilation. Case study, Radiopaedia.org. (accessed on 02 Nov 2022) https://doi.org/10.53347/rID-39908 • CC by-nc-sa 3.0 (modified)
Radiopaedia • CC-by-nc-sa 3.0 • de

The target sign of choledocholithiasis is a finding seen on contrast-enhanced CT and comprises:

  • central density within the bile duct: stone
  • surrounding low density: bile or mucosa