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The causes of pneumobilia include an incompetent Sphincter of Oddi (e.g. post sphincterotomy, or following passage of a gallstone), gallstone ileus, trauma, a duodenal ulcer perforating into the common bile duct, and secondary to surgery (e.g. cholecystoenterostomy).
The term pneumoperitoneum refers to the presence of air within the peritoneal cavity. The most common cause is a perforation of the abdominal viscusâmost commonly, a perforated ulcer, although a pneumoperitoneum may occur as a result of perforation of any part of the bowel; other causes include a benign ulcer, a tumor, or trauma.