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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 Causes of Pneumomediastinum. Pneumomediastinum is the name given to air in the mediastinum. Pneumomediastinum is often caused by injury or disease. It typically results when air leaks from your lungs into your mediastinum. Common causes of pneumomediastinum include: Excessive coughing. Repeated bearing down such as pushing during childbirth.