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DOI: 10.1055/a-1519-6939
Gel immersion endoscopic submucosal dissection for an anorectal tumor with hemorrhoids close to the dentate line
Endoscopic submucosal dissection (ESD) of anorectal tumors close to the dentate line poses an increased risk of intraoperative and delayed bleeding due to the development of venous flora, including hemorrhoids, in the rectal submucosa. Moreover, the narrow lumen and proximity of the anal sphincter decrease maneuverability and visibility in the resection field [1] [2]. Recently, during endoscopic hemostasis for gastrointestinal bleeding, the “gel immersion endoscopy” technique, involving injection of clear gel, was used to displace blood and clots to secure good visualization [3] [4]. We report the use of a novel gel product (VISCOCLEAR; Otsuka Pharmaceuticals Factory, Chiyoda, Japan), with a short procedure time, to overcome the difficulty of ESD for anorectal tumors close to the dentate line; this has not been described previously.
A 78-year-old woman presented with an anorectal tumor with hemorrhoids close to the dentate line ([Fig. 1]). ESD was required for en bloc resection of the tumor, but as hemorrhoids were scattered on the anal side of the tumor, hemorrhage during ESD was a concern. After obtaining written informed consent from the patient, gel immersion ESD was attempted ([Fig. 2], [Video 1]).




Video 1 Successful gel immersion endoscopic submucosal dissection for an anorectal tumor with hemorrhoids close to the dentate line.
Qualität:
With gel immersion, particularly on the proximal side of the tumor, where the lumen is narrowed by the anal sphincter, the tumor’s buoyancy provided a good dissection field ([Fig. 3]). Furthermore, as there was no carbon dioxide insufflation, the endoscope was not extruded from the patient’s body during excretion of excessive insufflation gas stored in the colorectum. Thus, endoscopic maneuverability remained stable during resection on the proximal side. When unexpected massive bleeding occurred, additional gel injection enabled immediate and easy implementation of hemostatic procedures ([Fig. 4]). The tumor was resected en bloc within an operative time of 35 minutes ([Fig. 5]).






Gel immersion ESD may be suitable for resection of anorectal tumors close to the dentate line.
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Competing interests
The authors declare that they have no conflict of interest.
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References
- 1 Tamaru Y, Oka S, Tanaka S. et al. Endoscopic submucosal dissection for anorectal tumor with hemorrhoids close to the dentate line: a multicenter study of Hiroshima GI Endoscopy Study Group. Surg Endosc 2016; 30: 4425-4431
- 2 Probst A, Ebigbo A, Märkl B. et al. Endoscopic submucosal dissection for rectal neoplasia extending to the dentate line: European experience. Endosc Int Open 2018; 6: E1355-E1362
- 3 Yano T, Nemoto D, Ono K. et al. Gel immersion endoscopy: a novel method to secure the visual field during endoscopy in bleeding patients (with videos). Gastrointest Endosc 2016; 83: 809-811
- 4 Miura Y, Yano T, Takezawa T. et al. Gel immersion endoscopy simplifies hemostasis during endoscopic submucosal dissection using the pocket-creation method. Endoscopy 2018; 50: E294-E295
Corresponding author
Publikationsverlauf
Artikel online veröffentlicht:
02. Juli 2021
© 2021. Thieme. All rights reserved.
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References
- 1 Tamaru Y, Oka S, Tanaka S. et al. Endoscopic submucosal dissection for anorectal tumor with hemorrhoids close to the dentate line: a multicenter study of Hiroshima GI Endoscopy Study Group. Surg Endosc 2016; 30: 4425-4431
- 2 Probst A, Ebigbo A, Märkl B. et al. Endoscopic submucosal dissection for rectal neoplasia extending to the dentate line: European experience. Endosc Int Open 2018; 6: E1355-E1362
- 3 Yano T, Nemoto D, Ono K. et al. Gel immersion endoscopy: a novel method to secure the visual field during endoscopy in bleeding patients (with videos). Gastrointest Endosc 2016; 83: 809-811
- 4 Miura Y, Yano T, Takezawa T. et al. Gel immersion endoscopy simplifies hemostasis during endoscopic submucosal dissection using the pocket-creation method. Endoscopy 2018; 50: E294-E295









