Mucosal defect closure after duodenal endoscopic submucosal dissection using the reopenable‐clip over the line method

INTRODUCTION: Closure of mucosal defects after duodenal endoscopic submucosal dissection (ESD) is important to prevent postoperative adverse events. Previously, we devised an underwater reopenable‐clip closure method for effective closure of mucosal defects under endoscopic guidance within the field of view. Recently, the usefulness of a method using a clip with a line passing through an accessory channel to close a mucosal defect has been reported. We also described a reopenable‐clip over the line method (ROLM) to completely close margin and the muscular layers of mucosal defects using a clip line. CASE REPORT: Our patient was a 70‐year‐old woman with a 40‐mm duodenal tumor in the descending portion of the duodenum. The lesion was completely resected using ESD . In the result, the mucosal defect size was approximately 50 mm, representing about 3/4 of the duodenal circumference. A clip‐line closure was performed using ROLM to close the mucosal defect's margins completely. An additional clip was applied to close the mucosal defect after ESD completely. Subsequently, the line was fixed with a modified locking‐clip technique, closed, and cut with endoscopic scissors. The patient was discharged without any adverse events 9 days after the duodenal ESD. DISCUSSION: Mucosal defect closure after duodenal ESD using ROLM is a novel method that can reliably close mucosal defects.