Evaluation of Diagnostic Yield of EUS-Guided Tissue Sampling

All patients will receive standard medical care and no experimental interventions will be performed. Endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) is a well-established procedure commonly used for the investigation of lesions within or adjacent to the gastrointestinal (GI) lumen (i.e. pancreas, liver, mediastinal masses, left adrenal gland, lymph nodes, and subepithelial lesions). EUS-guided tissue sampling has been commonly performed with different size and types of aspiration and core biopsy needles.