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A case of common bile duct ascariasis diagnosed by duodenoscopy is presented. At the admission, the patient, cholecystectomized for gallstones 13 years before, had been complaining of epigastric pain associated with post-prandial and nocturnal vomiting. Physical examination showed only slight tenderness in the epigastrium. Laboratory findings were within normal limits, with the exception of a moderate leukocytosis. Intravenous cholangiography showed the lack of visualization of the terminal common bile duct, but the flow of contrast medium was normal. Duodenoscopy, carried out without a specific clinical suspicion, revealed an ascaris lumbricoides inserted in the common bile duct and partially protruding from the papilla Vateri. The patient was treated by piperazine, intravenous fluids, antibiotics and a choleretic compound. After 24 hours an ascaris 33 cm long was excreted in the faeces and the patient became symptom-free. Some pathophysiological, clinical and epidemiological aspects of biliary ascariasis are discussed.
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