Most gallstones (60-80%) are asymptomatic ("silent stones").

• Mirizzi syndrome is a stone impacted in the cystic duct (Hartmann's pouch) compressing/narrowing the common hepatic duct, not a stone in the bile duct.
• Gallstone ileus happens when a stone passes through a biliary-enteric (cholecystoenteric) fistula into the bowel, usually impacting at the ileocecal valve - it does not travel down the bile duct.