Mirizzi syndrome seen on magnetic resonance cholangiopancreatography (MRCP)

Mirizzi syndrome. Two calculi in the dilated cystic duct (arrowheads), which parallels the extrahepatic bile duct. The inferior calculus (arrow) eroded through the wall of the cystic duct into the extrahepatic bile duct, bridging the two structures and resulting in obstruction of the bile duct.