Endoscopic ultrasound is an endoscopic surgery that combines the use of endoscope and ultrasound in one. Endoscopic examination allows doctors to examine the linings of the digestive tract, including the oesophagus, stomach and duodenum, while the use ultrasound allows doctors to scan the tissues underneath, ensuring a more thorough examination and an accurate diagnosis.
Endoscopic ultrasound has been widely adopted in examinations of oesophagus, stomach, pancreas, gall bladder, bile duct, liver, lung and thoracic lymph nodes. Its use in diagnosing submucosal malignancy, pancreatic cancer and submucosal cysts has been the most significant. Under ultrasound guidance, doctors can perform fine needle aspiration for a tissue biopsy. This technique may also be used in pancreatic pseudocyst drainage and celiac plexus block.