EUS or endoscopic ultrasonography is a procedure allows your physician to examine the walls of your upper and lower gastrointestinal tract and organs near the gastrointestinal tract such as the liver, gall bladder, bile duct and pancreas, as well as lymph nodes.
Your physician will use a thin, flexible tube called an echoendoscope with a miniature ultrasound probe. Depending on the area being examined, your physician will pass the endoscope through your mouth or anus, using the ultrasound to create sound waves that bounce back to generate visual images of the digestive tract.
EUS provides your doctor with more detailed images of your digestive tract than would be available with other tests. EUS can also be used to evaluate known abnormalities, including lumps or lesions, which were detected at a prior endoscopy or were seen on X-ray tests. With a detailed image of a lump or lesion, your doctor can determine its origin and the appropriate course of treatment.