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November 21, 2009
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Endoscopic Ultrasound
(EUS)

What is Endoscopic Ultrasound?

Endoscopic Ultrasound (EUS) combines endoscopy and ultrasound in order to obtain images and information about the digestive tract and the surrounding tissue and organs. Endoscopy refers to the procedure of inserting a long flexible tube via the mouth or the rectum to visualize the digestive tract (for further information, please visit the Colonoscopy and Flexible Sigmoidoscopy articles), whereas ultrasound uses high-frequency sound waves to produce images of the organs and structures inside the body such as ovaries, uterus, liver, gallbladder, pancreas, aorta, etc.

Traditional ultrasound sends sound waves to the organ(s) and back with a transducer placed on the skin overlying the organ(s) of interest. images obtained by traditional ultrasound are not always of high quality. In EUS a small ultrasound transducer is installed on the tip of the endoscope. By inserting the endoscope into the upper or the lower digestive tract one can obtain high quality ultrasound images of the organs inside the body.

Placing the transducer on the tip of an endoscope allows the transducer to get close to the organs inside the body. Because of the proximity of the EUS transducer to the organ(s) of interest, the images obtained are frequently more accurate and more detailed than the ones obtained by traditional ultrasound. The EUS also can obtain information about the layers of the intestinal wall as well as adjacent areas such as lymph nodes and the blood vessels.

Other uses of EUS include studying the flow of blood inside blood vessels using Doppler ultrasound, and to obtain tissue samples by passing a special needle, under ultrasound guidance, into enlarged lymph nodes or suspicious tumors. The tissue or cells obtained by the needle can be examined by a pathologist under a microscope. The process of obtaining tissue with a thin needle is called fine needle aspiration (FNA).



Next: When is EUS useful? »

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Endoscopic Ultrasound

What are gallstones?

Gallstones are stones that form in the gall (bile).

  • Bile is a watery liquid made by the cells of the liver that is important for digesting food in the intestine, particularly fat.
  • Liver cells secrete the bile they make into small canals within the liver.
  • The bile flows through the canals and into larger collecting ducts within the liver (the intrahepatic bile ducts).
  • The bile then flows within the intrahepatic bile ducts out of the liver and into the extrahepatic bile ducts-first into the hepatic bile ducts, then into the common hepatic duct, and finally into the common bile duct.

From the common bile duct, there are two different directions that bile can flow.

  • The first direction is on down the common bile duct and into the intestine where the bile mixes with food and promotes digestion of food.
  • The second direction is into the cystic duc...

Read the Gallstones article »










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