en Gastroenterology Gastroenterology case report case report Biliary ascariasis is a common disease in certain geographical areas of the world. The adult form of the worm usually lives in the human intestine. Biliary complications due to ascaris infestation are uncommon but are becoming an important clinical problem, as fatal cases have been reported in the literature. Many authors have recommended traditional surgical treatment for removal of the worms. Since the development of endoscopy and related techniques, it has become possible to treat biliary ascariasis endoscopically. In this article, we have presented a case of biliary ascariasis which was diagnosed with ultrasonography and confirmed with ERCP. We have also assessed the role of endoscopy in the diagnosis and treatment of this disease in the literature. Ascariasis, Biliary Tract Diseases, Sphincterotomy, Endoscopy, Ascaris lumbricoides. 399 402 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-298-300&slc_lang=en&sid=1 H FROUTAN 20031947532846004314 20031947532846004314 Yes From the Department of Gastroenterology, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran F MANSOUR GHANAIE 20031947532846004315 20031947532846004315 No the Department of Gastroenterology, Gastrointestinal and Liver Disease Research Center, Guilan University of Medical Sciences, Rasht, I.R. Iran H GHOFRANI 20031947532846004316 20031947532846004316 No From the Department of Gastroenterology, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran