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A 72 year old Asian woman, who grew up in Kenya and emigrated to the UK at the age of 36, was diagnosed with distal colitis on endoscopic and histological criteria. Treatment with mesalazine and oral corticosteroids led to remission.
Two months later she was readmitted with worsening diarrhoea, upper abdominal pain, and nausea. On physical examination she was afebrile and not tachycardic. There was abdominal tenderness. Blood tests revealed: white cell count 15.4×109/l, C-reactive protein 30 mg/l, and albumin 27 g/l. Stool specimens were negative for bacterial pathogens and Clostridium difficile. The working diagnosis was exacerbation of ulcerative colitis. She was treated with intravenous hydrocortisone (100 mg four times daily). Her symptoms worsened with severe abdominal pain and diarrhoea. The evaluation continued with upper gastrointestinal endoscopy. No macroscopic abnormality was seen. Haematoxylin-eosin staining of duodenal biopsies taken is shown in fig 1.
What is the diagnosis and treatment of choice?
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