A cytopathologist (#1) will be present during each EUS-FNA procedure to prepare the slides and determine whether each specimen was adequately cellular. After the procedure, all the cytological samples will be sent to the Pathology department in order to complete the study. A cytopathologist (#2) not present during the procedure will study all the sampling specimens obtained during the EUS-FNA procedure and produce the final and definitive cytopathological diagnosis.