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No previous studies have described endoscopic ultrasound-guided fine needle aspiration (EUS-FNA) only for intra-ampullary lesions of the papilla of Vater. We aimed to examine whether EUS-FNA can be used to diagnose such lesions.

Can Endoscopic Ultrasound-Guided Fine Needle Aspiration Offer Clinical Benefit for Tumors of the Ampulla of Vater? -An Initial Study