Abstract
A 77-year-old woman visited our hospital because of a physical checkup. Ultrasoundexamination and computed tomography of the liver showed a mild intrahepatic bile ductdilatation without space occupied lesions. Endoscopic retrograde cholangiography showed adefect like mucin in the common hepatic duct, but there was no tumor or irregularity of the bileduct wall. Peroral cholangioscopy(POCS)revealed a granular elevated mucosa and abnormalvessels in the intrahepatic bile duct of the left lobe. As bile duct cancer was highly suspected, she underwent left lobectomy and the lesion was diagnosed as well differentiated adenocar-cinoma, histologically. POCS is very useful for the detection of early bile duct carcinoma.
