Abstract
We reviewed the current status of peroral cholangioscopy under duodenoscopic assistance, which allows direct visualization of the bile duct. Direct visual assessment may be a useful adjunct to endoscopic retrograde cholangiopancreatography (ERCP) for distinguishing malignant from benign bile duct lesions. Several clinical studies suggest the efficacy of peroral cholangioscopy for various bile duct lesions. However, solely cholangioscopic examination may be insufficient to confirm accurate differential diagnosis between benign and malignant strictures or tumor extension of bile duct carcinoma. Directed tissue acquisition in biliary strictures by using peroral cholangioscopy is another application that has not been properly studied because of the limited maneuverability of the long babyscope. Further improvement of suitable instruments and cholangioscopes are needed.
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