Interventional endoscopic ultrasound.

Endoscopic ultrasound (EUS) has been used in clinical practice for the past two decades, mainly for staging upper gastrointestinal tract tumours. More recently the technique has been used to guide interventional procedures, particularly EUS-guided biopsy. In this review we describe the equipment and technique required for interventional EUS. We also discuss with illustrations the current clinical applications, potential complications and developments for the future.