Ascaris lumbricoides exists all over the world, especially in areas of Asia, Africa, and central America. In Japan, the incidence of Ascaris lumbricoides has been decreased because of the improvement of public hygience. However, Ascariasis has been gradually increasing according to the increment of the imported foods, and the trips to foreign countries. Ascaris infestation of biliary tree is an important though uncommon cause of cholangitis, obstruct jaundice and acute pancreatitis. A 60-year-old male, was admitted to Fukui Red Cross Hospital for severe epigastralgia. Laboratory studies revealed slightly elevated eosinocyte (six percente of the white blood cell), though liver function, pancreatic enzyme and other data were within normal limits. Ovum of Ascaris was not found in his feces. Abdominal ultrasonographic examination showed dilation of common bile duct (to approximately 10 mm), with echogenic non-shadowing strip with an anechogenic inner tube indicative of Ascaris. ERG (Endoscopic Retrograde Cholangiography) was also performed on the next day, and a linear filling detect was demonstrated in the common and hepatic bile ducts, and we diagnosed as a biliary Ascariasis. Two days later, ultrasonogra-phic examination showed the remaining Ascaris, ERC was performed again, and the worm was removed from the bile duct using stone extracer basket forceps without sphincterotomy nor sphincter balloon dilatation. The worm was shown to be a 15 cm-long male Ascaris lum-bricoides.
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