The successful use of peroral cholangioscopy for the diagnosis and treatment of the biliary tract lesions and giant bile duct stones in a 76-year-old man.

: We encountered a case in whom peroral cholangioscopy was useful for the diagnosis and treatment of irregular biliary tract mucosa and giant bile duct stones. Peroral cholangioscopy seems to improve the diagnosis of biliary tract diseases and allow internal treatment. The proper diagnosis of biliary tract diseases may be further confirmed by the concomitant use of narrow band imaging and this endoscopic technology.