During an upper endoscopy, an endoscope is easily passed through the mouth and throat and into the esophagus, allowing the doctor to view.
or transnasal esophagoscopy or upper endoscopy or to traverse narrow areas . with a gastroscope. Colonoscopy with a standard adult colonoscope was com-.
An upper endoscopy allows a doctor to look at the upper part of the gastrointestinal (GI) tract. This area is made up of the:Esophagus, which is the muscular tube.