Abstract
A 73-year-old woman, presented with a large tumor in the rectum. We conducted an endoscopic submucosal dissection (ESD) to remove the tumor, which was 9 cm in diameter from Ra to Rs, and approximately five sixths the circumference of the rectum. Accordingly, the whole circumference of the rectum was resected. Although she did not experience any major surgical complications, the patient started to have difficulty with defecation from the 23rd day after the operation. An endoscopic examination revealed a stenosis in the resected part. Endoscopic balloon dilatation was conducted twice, which relieved the patient's symptom.