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- May occur due to sphincterotomy, or Roux loop procedure.
- Reflux of gas from intestinal tract into biliary tree
- Linear distribution radiating from hilum
- Air predominantly in non-dependent portions of biliary tree
Imaging
- US: echo-reflective linear structures. Distinguished from calcification by their movement with respiration, bowel peristalsis or patient position.
- CT: extremely sensitive, easily visualized.