Contrast Enhanced Endoscopic Ultrasound FNA Versus Standard FNA in Diagnosis of Biliary Duct Tumors

Aims Contrast enhanced endoscopic ultrasound (CH-EUS) is superior to standard endoscopic ultrasound (EUS) for T staging of biliary duct tumors (BDT) but its role in guiding EUS-fine needle aspiration (EUS-FNA) is unknown. We compared the diagnostic performance of CH-EUS-fine needle aspiration (CH-EUS-FNA) and standard EUS-FNA in BTD and aimed to determine the factors influencing the results.