654 Inflammatory Bowel Disease and Risk of Interval Colorectal Carcinoma: What’s Missing in Surveillance Endoscopy?

Abstract Colorectal carcinomas in ulcerative colitis patients are more commonly missed endoscopically compared to those other symptomatic patients. They may present as flat lesions on a background of colitis, making them harder visualise. Those presenting after negative colonoscopies termed interval cancers, and account for up 50% colorectal cancers with inflammatory bowel disease (IBD). Professional bodies recommend the use chromoendoscopy IBD surveillance improve diagnostic yield by allowing targeted biopsies non-polypoid lesions. We an asymptomatic cancer patient UC following complete white light colonoscopy. After sole endoscopic finding small, raised rectal lesion, found be dysplastic, CT scan incidentally demonstrated ascending colon tumour. Had been used, this have detected initially. This case report demonstrates that tumours remain problem during endoscopy IBD.