Novel therapeutic thin endoscope facilitates endoscopic submucosal dissection for cervical esophageal cancer involving the pharyngoesophageal junction.

Abstract

The cervical esophagus, especially the pharyngoesophageal junction, is narrow; thus, the movement of the endoscope is severely limited [1] [2]. This region also has strong flexion to the posterior wall; thus, it is occasionally difficult to approach a lesion with a conventional endoscope with an insufficient downward angle. Recently, a novel therapeutic thin endoscope, EG-840TP (Fujifilm, Tokyo, Japan), has been developed. In this endoscope, despite an outer diameter of 7.9 mm, the working channel diameter is 3.2 mm with a downward angle of 160° ([Fig. 1], [Fig. 2]). Herein, we report a case in which this novel endoscope facilitates endoscopic submucosal dissection (ESD) for cervical esophageal cancer involving the pharyngoesophageal junction ([Video 1]).