Endoscopic ultrasound (EUS) is a medical procedure that combines endoscopy and ultrasound to obtain detailed images of the digestive tract and surrounding tissues and organs. During EUS, an endoscope with an ultrasound probe at its tip is inserted through the mouth or rectum. The ultrasound probe uses sound waves to create high-resolution images of the walls of the digestive tract and nearby structures, such as the pancreas, liver, and lymph nodes. EUS is used for diagnosing and staging cancers, evaluating pancreatitis, and guiding fine-needle aspiration (FNA) to obtain tissue samples for biopsy. This procedure provides valuable information for diagnosing and managing various gastrointestinal conditions.