When clinical doctors cannot diagnose the cause of biliary stricture after comprehensive laboratory and imaging examinations, it is collectively referred to as unexplained bile duct stenosis. This study intends to analyze the diagnostic value of the biliary endoscopy system for unknown cause biliary strictures , and compare the diagnostic efficacy of biopsy under biliary endoscopy guidance with brushing cytology under ERCP.
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positive rate of visual diagnosis of cholangioscopy for unexplained bile duct stenosis
Timeframe: 1 years
positive rate of cholangioscopy-guided forceps biopsy
Timeframe: 1 years