The over-the-scope (OTS) clip is effective for defect closure during endoscopic treatment
[1]
[2]. OTS clip closure has been reported to be effective in preventing delayed perforation
and bleeding, especially after duodenal endoscopic resection [3]. However, adverse events associated with the OTS clip itself have been reported,
including bleeding, perforation, infection, and failure to attach [4]
[5].
The patient was a 50-year-old man who underwent endoscopic submucosal dissection (ESD)
for an 80 mm, 0-IIa, superficial, nonampullary, epithelial tumor in the descending
duodenum. After endoscopic treatment, the ulcer was closed with OTS clips ([Fig. 1]). Fever and abdominal pain persisted after endoscopic treatment, and contrast-enhanced
computed tomography scan of the abdomen on the third day after endoscopic treatment
showed free air and abscess formation around the outside of the resection site ([Fig. 2]
a). Emergency upper gastrointestinal endoscopy was performed because of delayed perforation.
We tried to close the perforation, but the fragile edges of the perforation made it
difficult to close with conventional hemostatic clips. Then, we pulled the edge of
the perforation site and the tissue grasped by the previous OTS clip together, and
secured them with a new OTS clip ([Fig. 3], [Video 1]).
Fig. 1 Endoscopic submucosal dissection (ESD) and defect closure. a The 80 mm, 0-IIa, superficial, nonampullary, epithelial tumor in the descending duodenum.
b After ESD. c After suture of the ulcer base with an over-the-scope clip and standard clips.
Fig. 2 Contrast-enhanced abdominal computed tomography after endoscopic submucosal dissection
(ESD) showing abscess (arrowhead). a 3 days post-ESD. b Before discharge (37 days post-ESD).
Fig. 3 Emergency endoscopy. a Perforation was observed near the over-the-scope (OTS) clip used for ulcer closure
after endoscopic submucosal dissection (arrowhead). b The mucosa around the perforation and the mucosa that the OTS clip had grasped were
sutured with a new OTS clip. Closure of the perforation was achieved by the new OTS
clip over the first OTS clip.
Over-the-scope (OTS) clip on OTS clip technique. The mucosa grasped by the OTS clip
was suctioned into the hood together with the OTS clip itself, and a new OTS clip
was placed.Video 1
Endoscopy 14 days after ESD confirmed closure of the perforation ([Fig. 4]). Endoscopy 37 days after closure of the perforation confirmed maintenance of the
closure and revealed that the abscess had disappeared ([Fig. 2]
b); the patient was then discharged. Pathological findings showed curative resection
with adenocarcinoma, pTis (depth M), Ly0, V0, pVM0, pHM0 ([Fig. 5]).
Fig. 4 Endoscopy 14 days after endoscopic submucosal dissection confirmed closure of the
perforation.
Fig. 5 Pathology. The components of the highly differentiated ductal adenocarcinoma were
distributed in the range of 10 × 8 mm and 12 × 7 mm. The carcinoma was confined to
the mucosa with no invasion into the submucosa. Vascular invasion was negative. The
resection margins were judged to be negative, both horizontally and vertically.
OTS clips have a strong grasping force but are difficult to remove once implanted.
Using strong grasping force, we tried to pull together the edge of the perforation
site and the tissue grasped by the previous OTS clip. Finally, the perforation site,
including the previous OTS clip, was completely covered by the second OTS clip.
Endoscopy_UCTN_Code_CPL_1AH_2AZ_3AD
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