Endoscopy 2020; 52(10): E372-E373
DOI: 10.1055/a-1134-4567
E-Videos

Successful endoscopic resection using a bipolar snare for an adenoma overlying a transverse colonic lipoma

Shozo Osera
1   Department of Gastroenterology, Saku Central Hospital Advanced Care Center, Nagano, Japan
,
Tomoaki Shinohara
1   Department of Gastroenterology, Saku Central Hospital Advanced Care Center, Nagano, Japan
,
Akihisa Tomori
1   Department of Gastroenterology, Saku Central Hospital Advanced Care Center, Nagano, Japan
,
Tamaki Momoi
1   Department of Gastroenterology, Saku Central Hospital Advanced Care Center, Nagano, Japan
,
Hideki Fukushima
1   Department of Gastroenterology, Saku Central Hospital Advanced Care Center, Nagano, Japan
,
Takeshi Hisa
1   Department of Gastroenterology, Saku Central Hospital Advanced Care Center, Nagano, Japan
,
Satoshi Shiozawa
2   Department of Pathology, Saku Central Hospital Advanced Care Center, Nagano, Japan
› Author Affiliations
 

Colonic lipomas are uncommon mesenchymal neoplasms, and the transverse colon appears to be the rarest site for colonic lipomas [1]. Furthermore, it is rare to have an adenomatous polyp growing over the mucosal surface of a colonic lipoma.

A 72-year-old man was referred to our hospital from a private clinic for a colonic polyp overlying a submucosal tumour (SMT). The biopsied specimen taken at the private clinic revealed a tubular adenoma with fatty tissue. Endoscopy showed a type 0-IIa polyp, 12 mm in diameter, overlying a sessile SMT, with the mass having a positive cushion sign, in the transverse colon ([Fig. 1 a]). Magnifying narrow-band imaging revealed regular vessels and surface patterns ([Fig. 1 b]); therefore, we diagnosed an adenoma overlying a lipoma. We successfully performed hot snare polypectomy with a bipolar electrode ([Video 1]), and naked fat was visible at the base of the resection site ([Fig. 1 c]). There were no adverse events. Histological examination showed a tubular adenoma with low grade dysplasia and the fatty tissue was compatible with a lipoma ([Fig. 2]).

Zoom Image
Fig. 1 Endoscopic images showing: a a type 0-lla polyp overlying a sessile submucosal tumour in the transverse colon; b narrow-band imaging revealing regular vessels and surface patterns; c visible naked fat at the base of the resection site.

Video 1 Successful endoscopic resection using bipolar snare for adenoma overlying a transverse colonic lipoma.


Quality:
Zoom Image
Fig. 2 Pathological findings showing: a a tubular adenoma with low grade dysplasia on fatty tissue; b a lipoma beneath the tubular adenoma.

Endoscopic polypectomy of a colonic lipoma with a monopolar electrode is known to carry a risk of perforation as the lipomatous tissue has a low water content and therefore conducts electrosurgical current less efficiently [2]. Therefore, increasing the power to assist endoscopic resection may damage the adjacent bowel wall with subsequent perforation [3]. Placing an endoloop prior to an endoscopic resection can prevent perforations [4]; however, in our case, the shape of the SMT was sessile, meaning the endoloop wire would slip during closure so could not be placed. With the bipolar instrument, the electric current only flows from the snare toward a sheathed electrode, thereby avoiding deep thermal injury [5]. As a result, we were able to simply and safely resect the adenoma overlying the colonic lipoma using a bipolar snare, without any perforation.

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Competing interests

The authors declare that they have no conflict of interest.

  • References

  • 1 Moschetta M, Virelli R, Laricchia F. et al. Lipoma of the transverse colon covered by tubulovillous adenoma: a rare indication for surgical treatment. G Chir 2018; 39: 63-66
  • 2 Bahadursingh AM, Robbins PL, Longo WE. Giant submucosal sigmoid colon lipoma. Am J Surg 2003; 186: 81-82
  • 3 Geraci G, Pisello F, Arnone E. et al. Endoscopic resection of a large colonic lipoma: case report and review of literature. Case Rep Gastroenterol 2010; 4: 6-11
  • 4 Ivekovic H, Rustemovic N, Brkic T. et al. Endoscopic ligation (“Loop-And-Let-Go”) is effective treatment for large colonic lipomas: a prospective validation study. BMC Gastroenterol 2014; 14: 122
  • 5 Saraya T, Ikematsu H, Fu KI. et al. Evaluation of complications related to therapeutic colonoscopy using the bipolar snare. Surg Endosc 2012; 26: 533-540

Corresponding author

Shozo Osera, MD, PhD
Department of Gastroenterology
Saku Central Hospital Advanced Care Center
3400-28, Nakagomi, Saku
Nagano 385-0051
Japan   
Fax: +81-267-887354   

Publication History

Article published online:
27 March 2020

© Georg Thieme Verlag KG
Stuttgart · New York

  • References

  • 1 Moschetta M, Virelli R, Laricchia F. et al. Lipoma of the transverse colon covered by tubulovillous adenoma: a rare indication for surgical treatment. G Chir 2018; 39: 63-66
  • 2 Bahadursingh AM, Robbins PL, Longo WE. Giant submucosal sigmoid colon lipoma. Am J Surg 2003; 186: 81-82
  • 3 Geraci G, Pisello F, Arnone E. et al. Endoscopic resection of a large colonic lipoma: case report and review of literature. Case Rep Gastroenterol 2010; 4: 6-11
  • 4 Ivekovic H, Rustemovic N, Brkic T. et al. Endoscopic ligation (“Loop-And-Let-Go”) is effective treatment for large colonic lipomas: a prospective validation study. BMC Gastroenterol 2014; 14: 122
  • 5 Saraya T, Ikematsu H, Fu KI. et al. Evaluation of complications related to therapeutic colonoscopy using the bipolar snare. Surg Endosc 2012; 26: 533-540

Zoom Image
Fig. 1 Endoscopic images showing: a a type 0-lla polyp overlying a sessile submucosal tumour in the transverse colon; b narrow-band imaging revealing regular vessels and surface patterns; c visible naked fat at the base of the resection site.
Zoom Image
Fig. 2 Pathological findings showing: a a tubular adenoma with low grade dysplasia on fatty tissue; b a lipoma beneath the tubular adenoma.