TOPICS: Right hepatic duct, left hepatic duct, common bile duct, cystic duct, duodenum, ampulla of Vater, bile composition, deoxycholic acid, lithocholic acid, glycine, taurine, bilirubin, gallstone, estrogen, HMG-CoA reductase, hypercholesterolemia, bile acids, Crohn’s disease, radiolucent, radiopaque, conjugated bilirubin (CB), unconjugated bilirubin (UCB), choledocholithiasis, biliary colic, obstructive jaundice, hepatobiliary (HIDA) Scan, hepatobiliary system, acute cholecystitis, bile acid recycling