Endoscopy is a procedure by which the interior of the organs using a device called an endoscope, which is a narrow, flexible tube with a camera built into its end review. The camera records and saves the scanned images of the inner structure and transmitted to a monitor through which the doctor can examine in detail these organs. It is a method minimamete invasive and is used primarily to confirm diagnoses, biopsy, remove foreign bodies and perform simple procedures such as removal of small tumors or polyp removal. Normally in digestive scans, endoscopy is required to perform sedation to avoid discomfort to the patient, such as in the lower gastrointestinal endoscopy, colonoscopy also called. Prior to the realization of these tests, the doctor tells the patient that preparation should be done, depending on the organ to be scanned ( for example, follow a special diet the previous days). On the other hand, EUS is the realization of endoscopy with ecografo at the end, which also features a camera. It is typically used to locate tumors in the esophagus, stomach, intestine and rectum, as well as obtain samples of tissue and repair the lesions found.