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Endoscopic ultrasound (EUS) is an endoscopic procedure for imaging of the upper gastrointestinal tract (esophagus, stomach, and duodenum), and the pancreatobiliary system (bile ducts, gallbladder, and pancreas) using a flexible endoscope equipped with a small specialized ultrasound probe. EUS can be both a diagnostic and therapeutic procedure. Common conditions that can be evaluated by EUS are gastrointestinal tract and pancreatic tumors, submucosal tumors, mucosa-associated lymphoid tissue (MALT) lymphoma, acute and chronic pancreatitis, pseudocystsand mediastinum lymph node.

EUS guided Fine Needle Aspiration is a valuable tool for specimen acquisition in the evaluation of benign or malignant mass lesions Patients are given sedation before undergoing EUS. Depending on the disease condition being evaluated, the duration of EUS examination usually lasts from 20 to 40 minutes.

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