Additional Study Information: The purpose of this Registry is to develop a database to store information from subjects who haveundergone an examination of the esophagus with the NvisionVLE Imaging System. This is done bythe collection and analysis of the medical record information, imaging data, and physicianquestionnaires. The information is then stored in a database and may be used at a later time for variousfuture analyses. You are being asked to participate in this Registry because you are scheduled to have an endoscopic evaluation of your esophagus by a standard procedure called EGD (esophagogastroduodenoscopy) aswell as an imaging procedure called VLE (volumetric laser endomicroscopy). Both the endoscope andthe NvisionVLE Imaging System are cleared for use by the U.S. Food and Drug Administration(FDA).