In a healthy individual with normal anatomy, there is no air within the biliary tree. When this finding is present, it may be secondary to: * Recent surgical or endoscopic biliary procedure (e.g. ERCP, biliary enteric anastomosis) * Incompetent sphincter of Oddi (e.g. passage of large gallstone, scarring related to chronic pancreatitis) * Spontaneous biliary enteric fistula (e.g. gallstone ileus) * Infection by gas-forming organisms (e.g. emphysematous cholangitis) * Congenital abnormalities Other rare causes that have been reported include duodenal diverticulum, paraduodenal abscess, operative trauma, and carcinoma of the duodenum, stomach and bile duct.
Pneumobilia
Haemobilia
Biliary fistula
Biliary colic
Gallbladder flush
Hemoperitoneum
Pneumoperitoneum
Biliary sludge