Classifying extrahepatic bile duct metachronous carcinoma by de novo neoplasia site

Figure 1 Imaging findings and gross specimen of the later metachronous bile duct tumor in case 1. A: The arrow indicates the dilated remnant distal bile duct, and the arrow heads indicate the polypoid mass lesion of the distal remnant bile duct; B: Endoscopic retrograde cholangiopancreatography revealed mild dilatation of the intrapancreatic remnant bile duct with a filling defect (arrows); C: A gross examination of the resected specimen shows a polypoid mass arising from the remnant bile duct with invasion into the pancreas.