Air in the biliary tract is seen in all except –
Gall stone ileus
Sclerosing cholangitis
Carcinoma gall bladder
Endoscopic papillotomy
Gallstone ileus, carcinoma gall bladder and endoscopic papillotomy can cause pneumobilia (air in biliary tract)
Ascending cholangitis (not sclerosing cholangitis) can cause pneumobilia.