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A 75-year-old man underwent surveillance colonoscopy after polypectomy at another institution. Colonoscopy revealed a laterally spreading tumor involving a diverticulum in the ascending colon. He was referred to our hospital for further examination and treatment.
Colonoscopy at our institution revealed a laterally spreading tumor (LST) involving a diverticulum in the posterior wall of the ascending colon (Figure 1, Figure 2). The lesion was a granular-nodular mixed-type LST, and the Japanese Narrow-band Imaging Expert Team classification was type 2A (ie, no evidence of invasion). Therefore, we performed endoscopic resection instead of surgical intervention.
Figure 1Colonscopic view showing a laterally spreading tumor in the ascending colon.
The procedure was performed with continuance of aspirin therapy because the patient had a history of abdominal aortic aneurysm, aortic dissection, and myocardial infarction and had undergone coronary-artery bypass graft surgery. Because it was difficult to remove the lesion involving the diverticulum by conventional EMR, we performed traction-assisted colonic endoscopic submucosal dissection using a clip-and-line to facilitate efficient submucosal dissection (Video 1, available online at www.VideoGIE.org).
After injection of a sufficient amount of hyaluronic acid, a mucosal incision was performed on the diverticular side of the tumor and then on the anal side by use of a FlushKnife BT (DK2618JB15; Fujifilm Medical, Tokyo, Japan). We then grasped the anal side of the tumor with the clip-and-line. However, it was impossible to create a flap because of interference from the anal fold of the colon (Fig. 3).
Figure 3During traction-assisted endoscopic submucosal dissection, creating a flap was difficult because of interference from the anal fold of the colon.
so that pulling the line with appropriate tension, depending on the situation, enabled good visibility of the submucosal layer (Fig. 5). Considerably better visibility of the submucosal layer was afforded by traction on the line, and the tumor was resected en bloc in 29 minutes (Fig. 6).
Figure 4The addition of another clip to the bottom of the cecum to create a “pulley.”
A small muscle defect was seen at the location of the diverticulum in the mucosal defect (Figure 7, Figure 8), and the entire mucosal defect was completely closed with clips (Fig. 9). After the line was cut with scissors forceps, the lesion was retrieved through the anus. Prophylactic antibiotics were prescribed for 4 days after the procedure. Oral feeding commenced on day 3 postoperatively, and the patient was discharged on day 6. Pathologic examination of the lesion showed high-grade dysplasia with negative margins.
Figure 7Mucosal defect present after endoscopic submucosal dissection.
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