Tuesday, September 15, 2015

Which of the following may cause biliary obstruction?

Which of the following may cause biliary obstruction?






A. Ancylostoma
B. Entrobius
C. Strongyloides
D. Clonorchis   Ans: D.




Adult flukes of Clonorchis and Opisthorchis measure 8-15 mm and adult flukes of Fasciola measure 20-40 mm in length. The presence of flukes in the bile ducts causes dilatation of the bile ducts, varying degrees of chronic inflammation followed by adenomatous hyperplasia, and bile duct wall thickening. Imaging findings of clonorchiasis and opisthorchiasis include visualization of adult flukes in the bile ducts and gallbladder, diffuse dilatation of the peripheral small intrahepatic bile ducts with no or minimal dilatation of the large bile ducts, and thickening of the bile duct wall. In biliary fascioliasis and ascariasis, adult worms are visualized in the dilated bile ducts and gallbladder.
Ans: D. 

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