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Endoscopic ultrasound (EUS) is an advanced endoscopic procedure specialized for the evaluation of various benign and malignant diseases involving the gastrointestinal tract and pancreatobiliary system using an ultrasound probe equipped on a flexible endoscope. Depending on the disease condition being evaluated, an EUS procedure usually takes about 20 to 40 minutes. Common conditions that can benefit from EUS are listed below (Table 1).

With its high resolution imaging, EUS can provide important information for local staging in patients with suspected gastrointestinal or pancreatobiliary tumours. When histological diagnosis is needed, EUS guided Fine Needle Aspiration (EUS-FNA) is a valuable technique for specimen acquisition. In addition to diagnostic evaluation, EUS can also be therapeutic. For example, in patients with chronic pain from pancreatic cancer, EUS guided Celiac Plexus Neurolysis (EUS-CPN) can provide effective palliation of cancer related pain, improving quality of life.