Endoscopic Ultrasonography

EUS is a procedure in which your doctor is able to examine your stomach lining, as well as the walls of your upper and lower gastrointestinal tract.  The upper GI tract is the esophagus, stomach and duodenum; the lower GI tract includes your colon and rectum.  EUS is also used to study the internal organs that lie next to the gastrointestinal tract, such as the gallbladder and pancreas.  A thin, flexible tube called an endoscope is passed through your mouth or anus to the area to be examined.  Your doctor then will use the ultrasound attachment to produce sound waves that create visual images of the digestive tract.