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A clip in the right place: successful endoscopic submucosal dissection of a cecal tumor exhibiting the muscle-retracting sign
Among the challenges encountered during endoscopic submucosal dissection (ESD), firm “retraction” of the muscularis propria towards the tumor (the “muscle-retracting” sign) can lead to non-curative resection, failure to complete ESD, or perforation . Peranal endoscopic myectomy has been introduced as a means for dealing with such lesions, its merit however is currently limited to the lower rectum, where the muscularis propria is thicker compared with the rest of the colon . Based on the above, we decided to illustrate a technical variation of ESD that was used to achieve an R0 resection for a cecal type 0-Is tumor with the muscle-retracting sign ([Fig. 1]; [Video 1]).
Video 1 Endoscopic submucosal dissection of a cecal protruded-type tumor with the muscle-retracting sign.
During colonoscopy, an 18-mm 0-Is tumor was identified in the cecum of an 80-year-old man with a history of post-stroke paralysis. Because of the patientʼs age and underlying disease, ESD was performed. During ESD, a muscle-retracting area was recognized in the center of the lesion and the surrounding submucosa was dissected to expose this area. The mucosal incision was then completed, leaving only the muscle-retracting area temporarily intact ([Fig. 2 a]). In order to achieve R0 resection and prevent perforation, a reopenable hemoclip was anchored onto the muscle-retracting area as close as possible to the muscularis propria ([Fig. 2 b]). The remaining tissue above the clip was then dissected, while avoiding contact between the ESD knife and the metal “arms” of the hemoclip ([Fig. 2 c]). ESD was completed without perforation, and the ESD defect was completely closed with hemoclips to prevent delayed perforation.
The muscle-retracting area could be identified on the resected surface of the specimen ([Fig. 3]). Histopathologic examination revealed tumor invasion into the submucosa (4500 μm) just above the muscularis propria (pT1b), but the resection margins were negative and no lymphovascular invasion was documented ([Fig. 4]).
In conclusion, upon identification of the muscle-retracting sign during ESD, clipping at the base of the muscle-retracting area and dissection above the clip can prevent perforation while maximizing resection depth to ensure an R0 resection.
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Article published online:
25 October 2021
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