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EasyGastroenterologyUlcerative colitisca-mccqe1ca-rcpsc-im

A 19-year-old university student has 6 months of intermittent crampy abdominal pain, diarrhoea with blood and mucus, and weight loss. Colonoscopy shows continuous mucosal inflammation starting at the rectum and extending to the sigmoid colon. Biopsies confirm chronic colitis without granulomas. What is the most likely diagnosis?

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