Pneumobilia

Pneumobilia

Pneumobilia as seen on an abdominal X-ray, indicated by the arrow.

Pneumobilia refers to the presence of air within the biliary tree, which is an abnormal finding typically identified through imaging studies such as X-ray, ultrasound, or CT scan. This condition can be indicative of various underlying pathologies and requires careful evaluation to determine the cause.

Causes

Pneumobilia can result from several different conditions, including:

• Biliary-enteric anastomosis: Surgical connections between the bile ducts and the intestines can introduce air into the biliary system.
• ERCP: This procedure can introduce air into the biliary tree as a result of instrumentation.
• Biliary fistula: An abnormal connection between the bile ducts and the gastrointestinal tract can allow air to enter the biliary system.
• Infection: Certain infections, such as those caused by gas-forming organisms, can lead to pneumobilia.
• Gallstone ileus: A rare condition where a gallstone erodes into the intestinal tract, potentially allowing air to enter the biliary tree.

Diagnosis

The diagnosis of pneumobilia is primarily made through imaging studies. On an abdominal X-ray, pneumobilia may appear as branching radiolucencies in the right upper quadrant of the abdomen. Ultrasound may show echogenic foci with posterior acoustic shadowing or reverberation artifacts. CT scan is highly sensitive and can provide detailed images of air within the biliary tree.

Clinical Significance

While pneumobilia itself is not a disease, it is a sign that warrants further investigation to determine the underlying cause. The presence of air in the biliary tree can be associated with serious conditions that may require medical or surgical intervention.

Management

Management of pneumobilia depends on the underlying cause. If it is due to a benign cause such as a recent ERCP, no treatment may be necessary. However, if it is due to a pathological condition such as a biliary fistula or infection, appropriate medical or surgical treatment is required.

Related pages

• Biliary tract
• Cholangitis
• Gallbladder
• Liver