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Endoscopic ultrasound (EUS) or echo-endoscopy is a medical procedure in which endoscopy (insertion of a probe into a hollow organ) is combined with ultrasound to obtain images of the internal organs in the chest, abdomen and colon. It can be used to visualize the walls of these organs, or to look at adjacent structures.
An endoscopy unit consists of the following components: trained and accredited endoscopists (which are usually gastroenterologists or surgeons); trained nursing and additional staff; endoscopes and other equipment; preparation, procedural and recovery areas; a disinfection and cleaning area for equipment; emergency equipment and personnel; and, a program for quality assurance.
An endoscopy is a procedure used in medicine to look inside the body. [1] The endoscopy procedure uses an endoscope to examine the interior of a hollow organ or cavity of the body. Unlike many other medical imaging techniques, endoscopes are inserted directly into the organ.
Ultrasound image showing the liver, gallbladder and common bile duct. Medical ultrasound uses high frequency broadband sound waves in the megahertz range that are reflected by tissue to varying degrees to produce (up to 3D) images. This is commonly associated with imaging the fetus in pregnant women. Uses of ultrasound are much broader, however.
A relatively new and less-invasive method involving endoscopic ultrasound (EUS) guidance and fluoroscopy. A large bore needle is used to access the identified pseudocyst, creating a fistula between the cystic cavity and either the stomach or the duodenum. [6] Plastic stents may be placed to facilitate drainage from the pseudocyst. [4]
Staging information which is obtained prior to surgery, for example by x-rays and endoscopic ultrasound, is called clinical staging; staging by surgery is known as pathological staging. Clinical staging is done by a combination of imaging and sampling (biopsies), or stated differently, non-invasive (radiological) and invasive (biopsy) methods.
Endoscopic retrograde cholangiopancreatography (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. It is primarily performed by highly skilled and specialty trained gastroenterologists.
Esophageal endoscopic ultrasound can provide staging information regarding the level of tumor invasion, and possible spread to regional lymph nodes. The location of the tumor is generally measured by the distance from the teeth. The esophagus (25 cm or 10 in long) is commonly divided into three parts for purposes of determining the location.
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