ERCP or EUS for tissue diagnosis of biliary strictures? A prospective comparative study

Gastrointestinal Endoscopy
Thomas RöschMartin Werner

Abstract

The accuracy of ERCP-based brush cytology or forceps biopsy for tissue diagnosis is relatively low (usually not exceeding 70%). By contrast, reported accuracy rates for EUS-guided FNA of pancreatobiliary masses are over 80%. This prospective study compared these two modalities for the first time in the diagnosis of indeterminate biliary strictures and pancreatic tumors. Fifty consecutive patients (29 men, 21 women; mean age 62.1 years) with obstructive jaundice in whom a tissue diagnosis was required were included. During ERCP, intraductal specimens were obtained with a forceps and with two different types of brush (conventional and spiral suction) in random order. During EUS, only visible mass lesions or localized bile duct wall thickening were aspirated (22-gauge needle), with at least two passes yielding material sufficient for assessment. A cytopathologist was not present in the procedure room to evaluate specimen adequacy. The reference methods were surgery, other biopsy results, follow-up until death, or the conclusion of the study (mean follow-up 20 months). The final diagnoses were malignancy, 28 (16 pancreatic, 12 biliary), and benign biliary stricture, 22. Sensitivity and specificity for ERCP-guided biopsy were 36% an...Continue Reading

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