An endoscopic ultrasound (EUS) involves passing a thin tube (endoscope) through the mouth, down the esophagus and into the stomach. The tube has an ultrasound device, a light and a tiny camera. Ultrasound uses soundwaves to create pictures of internal parts of the body. EUS allows your doctor to see the pancreas and other organs.
For parts of the body that are harder to see with an ultrasound from the outside, doctors use ultrasound devices that go inside the body.
Your doctor might recommend EUS if you have abdominal pain or other symptoms that can’t be explained. Your doctor can check for inflammation, scarring, cysts and noncancerous (benign) and cancerous (malignant) tumors. Your doctor may also take a sample of your cells (biopsy) or fluids during the EUS.