Abstract
Transnasal endoscopy is considered suitable for screening examination. It is safer and easier to accept than conventional endoscopy. However, transnasal endoscopy involves many problems yet to be solved, including image resolution. At first we pay attention to a performance difference according to the generation of transnasal endoscopy. It is necessary to use the method of the preparation properly by thinking about the balance with the diameter of the transnasal endoscope used. It seems that transnasal endoscope is enough precious examination for screening endoscopy. However, the detection rate of gastric cancer from the non-atrophic gastritis in transnasal endoscopy is significantly less than conventional endoscopy. Targetting biopsy of transnasal endoscope is almost equal to the conventional endoscope according to the appearance of a new device.
