text: <unk>  is air in the biliary tree. It is most commonly seen in patients following surgery in which a biliary-enteric anastomosis has been created or a sphincterotomy (sphincter of Oddi) has been performed. Nonsurgical causes of<unk>  are uncommon and are usually indicative of serious disease. Possible nonsurgical causes of<unk>  include infection, neoplasm, biliary-enteric fistula, emphysematous cholecystitis and incompetence of the sphincter of Oddi.
option_0: Pneumobilia
option_1: Haemobilia
option_2: Biliary fistula
option_3: Gallbladder volvulus
option_4: Hemoperitoneum
option_5: Pneumoperitoneum
option_6: Ascites
option_7: Gallbladder sludge