Under sedation with propofol, EUS will be performed using a curved-array transducer. A 25 G needle with a central stylet to protect the aspiration channel of the needle will be introduced though the endoscope's working channel. RTE assessment of pancreatic masses will be performed using a last generation ultrasound machine, and all suspicious areas at elastography (i.e. those appearing in dark blue color as a consequence of higher cellularity of tumoral tissue) will be recorded and stored in our database. Beside qualitative assessment based on red-green-blue color map, a semi-quantitative approach providing a numeric value expressed as strain ratio5 will be undertaken.