- Pneumobilia is air in the biliary tree
- It is most commonly seen in patients following surgery in which a biliary-enteric anastomosis has been created or a sphincterotomy (sphincter of Oddi) has been performed.
- Nonsurgical causes of pneumobilia are uncommon and are usually indicative of serious disease.
- Possible nonsurgical causes of pneumobilia include infection, neoplasm, biliary-enteric fistula, emphysematous cholecystitis and incompetence of the sphincter of Oddi.
 Imaging Findings
- Air in the biliary tree. Air is usually central in the liver (as opposed to portal venous gas which is peripheral).
 See Also
 External Links
- American Family Physician. Air in the biliary tree as a sign of small bowel obstruction.