Choledocholithiasis or bile duct stone refers to the passage of gallstones into the bile duct. The gallstones obstruct the bile duct, causing jaundice.
Endoscopy is a group of procedures, including colonoscopy and sigmoidoscopy, for viewing the internal body cavities using a camera on a long flexible tube.
ERCP (endoscopic retrograde cholangiopancreatography) is a procedure for viewing from the mouth to the duodenum to diagnose pancreatic or billiary disease.