All EUS examinations will be performed under conscious sedation (midazolam, fentanyl) by one two experienced endosonographers according to the standard procedures at the CHUM and using a linear echoendoscope. , If the lesion is considered solid and EUS-FNA is considered clinically indicated and safe, the patient will be enrolled and the randomisation envelope will be opened. EUS-FNA Biopsies will be obtained with both the 25S and 25P needles in each lesion; a randomisation sequence will set in order to determine which of the two needles will first be used (25S or 25P).