Endoscopic Ultrasound-guided Fine-needle Biopsy for Tissue Sampling of Biliary Strictures: a Multicenter Prospective Study

"Endoscopic ultrasound will be performed using a curvilinear array echoendoscope. FNB with 22G or 25G end-cutting needles will be performed. The size of the needles will be based on the personal choice of the endoscopist. Likewise, the sampling technique, whether using the slow-pull, the dry suction, or the wet suction, will be based on the physician's choice. Three passes will be performed as per current guidelines. Specimens will be collected in 3 vials to allow for analysis according to needle pass; one for the first pass, one for the second pass, and one for the third and any eventual subsequent passes.~The rapid-on site cytological evaluation (ROSE) will not be available in this study."