Fig. 1

Preoperative ultrasonography. Abdominal ultrasonography showed a hyperechoic lesion, 40 mm in diameter, located in the left hepatic bile duct (white arrow), and extended dilation of the distal left intrahepatic bile duct (yellow arrow)
Preoperative ultrasonography. Abdominal ultrasonography showed a hyperechoic lesion, 40 mm in diameter, located in the left hepatic bile duct (white arrow), and extended dilation of the distal left intrahepatic bile duct (yellow arrow)