The positive yield of acid-fast bacilli from bile cytology
on endoscopic retrograde cholangiopancreatography (ERCP) is also very low, further complicating diagnosis.
Isayama et al., "Clinical significance of bile cytology
via an endoscopic nasobiliary drainage tube for pathological diagnosis of malignant biliary strictures," Journal of Hepato-Biliary-Pancreatic Sciences, vol.
At the same time, the sensitivity of bile cytology
was very low, the sensitivity of nasal aspiration cytology and bile duct drainage fluid cytology were respectively 30% and 24%.