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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).
When the pneumothorax is due to an underlying lung condition such as emphysema, it is known as a secondary spontaneous pneumothorax. In this, the emphysematous blebs are larger and known as bulla. There are different types of pneumothorax, each defined by its cause: 1  Primary spontaneous pneumothorax occurs when you donât have an underlying lung disease. It is often caused by the rupture (bursting) of an air-filled sac in the lung, called a bleb or bullae.