ASGE DDW Videos from Around the World | 2025-SUBMUCOSAL TUNNELING ENDOSCOPIC RESECTION WITH FULL-THICKNESS MUSCLE EXCISION FOR A SUBEPITHELIAL LESION OF DESCENDING COLON

SUBMUCOSAL TUNNELING ENDOSCOPIC RESECTION WITH FULL-THICKNESS MUSCLE EXCISION FOR A SUBEPITHELIAL LESION OF DESCENDING COLON

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Video Transcription

Video Summary

The video describes using submucosal tunneling endoscopic resection (STER) with a full-thickness muscle incision to remove a 25 mm subepithelial lesion in the descending colon. Because colonic EFTR for lesions >20 mm carries higher adverse-event risk and higher local residual rates than ESD, the team chose STER. EUS showed a hypoechoic tumor from the muscularis propria with partial extraluminal growth. A submucosal tunnel was created, but the tumor could not be separated from muscle, requiring full-thickness incision. The specimen was removed, the mucosa preserved, and the defect closed with clips. Pathology: leiomyoma. Recovery was uneventful.

Asset Subtitle

Suhuan Liao

Keywords

submucosal tunneling endoscopic resection (STER)

descending colon subepithelial lesion

full-thickness muscle incision

muscularis propria leiomyoma

endoscopic defect closure with clips