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The normal esophageal mucosa was observed in detail using ultra‐high magnification endoscopy (UHM endoscopy). The UHM endoscope has a magnification capacity ranging from eight to 150x. High‐quality UHM endoscopic pictures can be continuously obtained by attaching a 2‐mm depth soft distal attachment to the tip of the UHM endoscope. The vascular architecture, which extends from the submucosal vessels through the proper mucosal layer, can be continuously visualized, thereby demonstrating the characteristic fine‐vascular network pattern, and the intrapapillary capillaries in the epithelium. With UHM endoscopy, intrapapillary capillaries can be clearly demonstrated as single loop vessels which we have termed “intrapapillary loops.” These structures cannot be observed with an ordinary magnifying endoscope which is capable of only 35x magnification. We conclude that a technique for obtaining high‐resolution endoscopic pictures has been established. The images obtained are useful for elucidating the microstructure of the esophageal mucosa, especially the fine‐vascular network and the newly recognized intrapapillary loop.

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