An Endoscopic Ultrasonography or EUS is a minimally invasive diagnostic test your doctor can use to investigate areas of concern in your digestive tract. The test creates a visual image, using sound waves, of organs near the gastrointestinal tract. The specialists at Vanguard Gastroenterology professionals have extensive training and experience performing an EUS. Our specialists use an EUS to examine the upper portion of your digestive tract and small intestine, including your stomach, esophagus and the duodenum. An endoscopic ultrasonography can also be used to examine the lower portion of your digestive tract including your colon and rectum. Other organs can also be studied with an EUS including the pancreas, gallbladder, liver, and lungs.