A Case of polyp that needed to differentiate from ulcerative colitis-associated neoplasia and for which removal with underwater EMR was useful for diagnosis

Abstract

A 27-year-old woman with ulcerative colitis (UC) underwent a colonoscopy for worsening symptoms. There was an elevated lesion in the sigmoid colon. A biopsy was performed on the lesion, resulting in atypical cells. She was referred to our hospital on suspicion of ulcerative colitis-associated neoplasia (UCAN). We performed a colonoscopy for further study. The lesion had no malignant findings, and we diagnosed the lesion as an inflammatory polyp. However, we performed underwater endoscopic mucosal resection (UEMR) as a total biopsy because the previous biopsy result was atypical cells. The pathological result of the lesion showed no malignancy, and the polyp was not UCAN. UEMR was effective for the polyp that has the mucosa with inflammation and fibrosis such as UC.