Endoscopic ultrasound technology is a relatively new technology that has been available over the last decade or so. It offers a window for us to reach certain organs in the body that are very difficult to reach. Examples are the gallbladder, the pancreas and the bile ducts. Many times, small precancerous lesions, tumors, gallstones or pancreas diseases can be seen and visualized very well with endoscopy ultrasound. It offers an unprecedented access to these organs that are not usually available with other techniques such has a CT scan or MRI. There are certain diseases that are only diagnosed with endoscopic ultrasound, and that has been a major breakthrough in gastroenterology. Endoscopy ultrasound also offers an access to reach some tissue in these important organs by using a small needle that can be guided under ultrasound guidance to obtain biopsies from precancerous lesions, cysts and tumors in the body.