Endoscopic Ultrasound (EUS) is a medical procedure that combines endoscopy and ultrasound to examine the digestive tract and surrounding organs. During the procedure, a thin, flexible tube with a camera and ultrasound device is inserted through the mouth or rectum. This allows doctors to get detailed images of the esophagus, stomach, pancreas, and other nearby structures, helping them diagnose conditions like tumors or cysts. EUS is minimally invasive and often used for both diagnosis and treatment. It can guide fine-needle aspiration, where a needle is used to collect tissue samples for testing. This technique is valuable for detecting diseases early and planning appropriate treatments.