EUS (Endoscopic Ultrasound)

What is EUS?

Endoscopic ultrasound (EUS) is an endoscopic technique used to visualise the layers of the gastrointestinal tract and surrounding internal organs. Areas that can be seen and examined include the oesophagus, stomach, duodenum, liver, gallbladder, pancreas and lungs.

EUS uses a special type of instrument that is an endoscope (long flexible tube with a light and camera on the end) with a built-in ultrasound probe at the tip. Through the use of the ultrasound, the endoscopist can look at the individual layers of the wall of the gastrointestinal tract as well as outside the wall without having to do an operation.

Why is EUS performed?

EUS is often organised after several other investigations have been performed (CT scan, gastroscopy) and demonstrate a lesion or lump that needs more detailed investigations to determine what exactly the lesion is and what can be done for treatment.

EUS is often, but not always, performed in patients with lesions suspicious for cancers. EUS can help determine the spread of the tumour/cancer (staging). In some patients it can be used to obtain a specimen/biopsy to determine the correct diagnosis.

How is EUS performed?

EUS is typically performed in a teaching hospital due to the expensive nature of the equipment and the highly technical nature of the procedure. The procedure is similar to that of a gastroscopy except the duration is usually between 30-60 minutes. The procedure is typically performed as a day procedure. Deep sedation or general anaesthesia is often used during the procedure. Is biopsies are performed, antibiotics may be given to prevent the risk of infection. As a result of the anaethesia used during the procedure.

What are the risks of EUS?

Although complications can occur, they are rarely serious. A sore throat is the most common side effect, as is bloating following the procedure. Infection can uncommonly occur in certain situations and is prevented with antibiotics. The major but rare complication (<1/10000) with EUS is a tear in the wall of the gastrointestinal wall (perforation); this may require an operation.

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