Endoscopic Ultrasound (EUS)

EUS is a specialised form of endoscopy. A standard endoscope is a thin, flexible tube with a camera that looks at the inner lining of the digestive tract. EUS adds a small ultrasound probe at the tip, so that once the scope is inside the body, the probe can send sound waves into the wall of the tract and the organs beyond it. Because the probe sits so close to these structures, the images are far more detailed than ultrasound performed on the skin from outside. This makes EUS especially good at studying the layers of the gut wall and neighbouring organs such as the pancreas.

The procedure is usually carried out under sedation to keep the patient comfortable and relaxed. The endoscope is gently passed through the mouth into the oesophagus, stomach and the first part of the small intestine, or through the back passage for the lower bowel, depending on the area being studied. The camera guides the way while the ultrasound probe produces close-up images of the wall and surrounding organs. If a suspicious area or lymph node is seen, a fine needle can be passed through the scope, under ultrasound guidance, to take a sample of cells or tissue, which is then sent to the laboratory.

EUS is widely used to diagnose and stage cancers of the oesophagus, stomach, rectum, bile ducts and pancreas, helping to judge how deep a tumour goes and whether nearby lymph nodes or blood vessels are involved, which guides treatment decisions. It is also valuable for assessing pancreatic cysts and masses, gallstones in the bile ducts, and lumps in the gut wall. Because it can both image and sample in one session, it often gives a clear answer with a single, gentle procedure, sparing the patient more invasive surgery. The plan is always tailored to the individual case.

The main benefits of EUS are exceptionally detailed images of deep digestive organs and the ability to take a precise tissue sample at the same time, all without a surgical cut. It is minimally invasive, usually done as a day procedure, and most people recover quickly. Because it is performed under sedation, you feel little or nothing during it and remember little afterwards. You may have a mild sore throat or bloating for a short time. After a brief period of monitoring most people go home the same day, and the care team explains the results and any next steps once any samples have been analysed.