Organism causing billiary duct obstruction:
Hepatobiliary Parasitism
Common in Southern china
Biliary tract is infestated by adult helminthes or their ova
Causes :
Trematodes (Liver or biliary flukes) MC
Clonorchis sinensis
Opisthorchis viverrini or O. felineus
Fasciola hepatica
Nematode (Ascaris lumbricoides by intraductal migration of adult worm
Clonorchis sinensis
Ankylostoma duodenale
Strongyloides stercales
Enterobius vermicularis