Endoscopic ultrasound (EUS) combines two techniques — endoscopy and ultrasound — to help doctors see, evaluate and diagnose conditions in and near the gastrointestinal (GI) tract.

Endoscopic ultrasound is a minimally invasive procedure that uses a camera device (endoscope) together with high frequency sound waves (ultrasound) to examine the GI tract and beyond.

A regular endoscope is a thin, lighted tube that can be inserted through the mouth or anus to view inside your esophagus, stomach or intestines. EUS uses a special endoscope with a small ultrasound device on its tip, called an echoendoscope. Addition of ultrasound lets the doctor see the GI tract and surrounding organs.