Endoscopic ultrasound (EUS) has evolved in recent years into a technique with a major clinical impact in digestive and mediastinal diseases. In fact, EUS has represented a major advance in the diagnosis and staging of several tumors, and can determine a change in diagnosis and management in 25% to 50% of cases. EUS also provides guidance for fine-needle aspiration of almost all lesions detected during a standard procedure. In addition, several new diagnostic techniques associated with EUS have being developed…