Endoscopic ultrasound is a minimally invasive procedure that allows physicians to see into the digestive tract and surrounding organs to evaluate cancer, chronic pancreatitis and other illnesses. The physician uses an endoscope -- a flexible tube with a camera -- that has a small ultrasound transducer attached to it and is inserted through the mouth or rectum. Patients are sedated for the procedure, which generally lasts 30 to 90 minutes.

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