Endoscopic Ultrasound (EUS)
EUS is a combination of endoscopy and ultrasonography. It is a non-invasive and effective method of examining the internal organs in the chest and abdomen.
EUS allows your doctor to examine esophageal and stomach linings as well as the walls of your upper and lower gastrointestinal tract. The upper tract consists of the esophagus, stomach and duodenum. The lower tract includes your colon and rectum. EUS is also used to study other organs that are near the gastrointestinal tract, including the lungs, liver, gall bladder and pancreas.
The endoscopist uses a thin, flexible tube called an endoscope that has a built-in miniature ultrasound probe. Your doctor will pass the endoscope through your mouth or anus to the area to be examined and then uses ultrasound waves to create visual images of the digestive tract.
Why is EUS used for patients with cancer?
EUS helps your doctor determine the extent of spread of certain cancers of the digestive and respiratory systems. It accurately assesses the cancer’s depth and whether it has spread to adjacent lymph glands or nearby vital structures, such as major blood vessels. In some patients, EUS can be used to obtain a needle biopsy of a lump or lesion to help determine the proper treatment.
Endoscopic Retrograde Cholangiopancreatography (ERCP)
ERCP is a technique that combines the use of endoscopy and fluoroscopy to diagnose and treat certain problems of the biliary or pancreatic ductal systems. Through the endoscope, the doctor can see inside the stomach and duodenum and inject contrast dye into the ducts in the biliary tree and pancreas that can be seen on x-rays.
ERCP is used primarily to diagnose and treat conditions of the bile ducts and main pancreatic duct, including gallstones, inflammatory strictures (scars), leaks (from trauma and surgery), and cancer.