Draining Stenting Pancreatic tumor Vater's pappila tumor Bile duct tumor Anastomotic stricture Сholelithiasis Сholedocholithiasis Mirizzi's syndrome Pancreatic cyst Chronic pancreatitis Ligamentum hepatoduodenale Hepatic cyst Oesophagus Anathomy variants PTC MRI cholangiography Gallbladder tumor Video