2.1. EUSFNA Endoscopic Ultrasound (EUS) is the diagnostic method of choice when a pancreatic lesion is found incidentally on cross-sectional imaging. Endoscopic UltraSound-guided Fine Needle Aspiration (EUS FNA) (respectively Endobronchial Ultrasound-guided Fine Needle Aspiration (EBUS FNA)) are procedures where a target tissue in proximity to the GI tract (respectively the pulmonary tract) is biopsied using a fine needle guided in real time by an ultrasound probe fixed at the tip of an endoscope.It may therefore be applied to pancreatic lesions, or lymph nodes examination.