Introduction: The Surveillance for Colorectal Endoscopic Neoplasia Detection and Management in Inflammatory Bowel Disease Patients: International Consensus Recommendations guidelines recommend surveillance colonoscopy instead of colectomy after the complete removal of “endoscopically resectable” dysplastic lesions in ulcerative colitis (UC). There are no studies on long-term outcomes of endoscopic submucosal dissection (ESD) for UC-associated neoplasia (UCAN). We aimed to evaluate the clinical outcomes of ESD for UC-associated dysplasia (UCAD) during long-term follow-up. Methods: We retrospectively enrolled 17 consecutive UC patients with 22 UCADs, who underwent initial ESD or total proctocolectomy at the Hiroshima University Hospital. The clinicopathological features of the patients and neoplasias and clinical outcomes of ESD were evaluated and compared with those of total proctocolectomy. Results: UCAD in the ESD and total proctocolectomy groups was mostly noted on the left side of the colon, and most lesions were superficial macroscopic lesions. In the ESD group, en bloc resection and histological complete resection rates were 83 and 67%, respectively. One patient died of malignant melanoma; however, none of the patients died of UC-associated carcinoma in both groups. Metachronous neoplasias developed in 5 of the 7 patients in the ESD group. Among the 5 patients with metachronous UCAN, 4 finally underwent total proctocolectomy and 1 underwent additional ESD. Conclusions: ESD for UCAD is a useful method for total excisional biopsy. UC patients with UCAD resected by ESD have a high risk of developing metachronous UCAN during the follow-up period.

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