A 64-year-old man was referred to our hospital due to jaundice. Abdominal CT and MRI revealed a mass in the hepatic hilum and the intrahepatic bile ducts were dilated. We performed ERC following transpapillary biopsy. The pathological findings of biopsy sample suggested adenocarcinoma. The cholangiogram suggested the tumor extent to the left hepatic duct and lower bile duct. Therefore, we performed peroral cholangioscopy (POCS) and target biopsies under its direct vision to evaluate the exact tumor extent. As a result, we successfully determined the resection line before surgery.
POCS was useful to diagnose the exact tumor extent of cholangiocarcinoma.
