In this report, we present a case in which the progress from biliary ascariasis to common bile duct stone was tracked. A 84-year-old woman was transferred from another hospital because of abdominal pain caused by biliary ascariasis. An anthelmintic had been administered in the previous hospital and the worms in the bile duct were dead. The abdominal pain subsided immediately after transfer to the hospital. The patient herself did not agree to undergo a papillary incision and she subsequently left the hospital. However, one year and ten months later, she was admitted to the hospital again because of a common bile duct stone. After an endoscopic sphincterotomy, two stones were removed from the bile duct. Histopathological examination of the stones, showed worms in the center of the stones.
In recent years, clinical cases of biliary ascariasis have increased with an increase of the risk of acquiring ascariasis infection by eating chemical-free vegetables, by traveling overseas, and by sending workers abroad. We report the case described here, together with a review of the literature.