Video 1  Pharyngeal endoscopic submucosal dissection using an ultrathin endoscope. Pharyngeal ESD using an ultrathin endoscope was performed to resect a superficial hypopharyngeal cancer measuring 30 mm in diameter located in the left pyriform sinus. Complete resection was achieved using the “SOUTEN” multifunctional snare, without any adverse events. English subtitles for video: A tumor was located in the left pyriform sinus adjacent to the hyoid bone. Marking was performed with the tip of SOUTEN. Local injection was administrated using half Glyceol. Mucosal flap was created with the tip of SOUTEN Dissection became difficult due to vertical approach. We switched to the transnasal approach. It became easy to dissect with a parallel approach to the lesion. Then, additional local injection was made. Mucosal incision and dissection on the posterior wall were performed. The manipulation of the endoscope became unstable due to interference by the hyoid bone. With the switch to the oral approach, dissection became possible. After additional injection, a circumferential incision and trimming were made. Switching to the transnasal approach again, the remaining subepithelial layer was dissected. The lesion was completely removed. Finally, the lesion was collected with SOUTEN.

Download video file ^{(60.9MB, mp4)}