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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).
There are five main causes of pneumonia: 1  Bacteria. 2  Viruses. 3  Mycoplasma. 4  Other infectious agents, such as fungiâincluding pneumocystis. 5  Various chemicals.