Balloon overtube-guided colorectal endoscopic submucosal dissection

Figure 3 A colorectal laterally spreading tumor (LST) in the transverse colon that was difficult to approach with a standard endoscope. A: Retroflex view of the sessile granular-type lesion in the hepatic flexure of the transverse colon. The sharp angle of the colon made it difficult for a stabilized scope maneuver; B: Submucosal dissection plane with good elevation using hyaluronic acid injection; C: Gross specimen, showing the sessile, raised lesion resected en bloc.