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ModerateGastroenterologyUlcerative colitisuk-plab-1

A 26-year-old man presents with a 2-month history of bloody diarrhoea, tenesmus and lower abdominal pain. He passes stool 6–8 times per day with urgency. He has no perianal disease. Sigmoidoscopy shows continuous mucosal inflammation extending from the rectum to the sigmoid colon. What is the most likely diagnosis?

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