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A 31-year-old man visited our gastroenterology clinic owing to continuous epigastric pain lasting 3 months, diarrhoea during the previous month and an associated 10 kg weight loss. An ulcer in his antrum was discovered by oesophagogastroduodenoscopy (EGD), and he took a proton-pump inhibitor for a month. However, his clinical symptoms and ulcer worsened. He denied melena, haematemesis, fever, arthralgia, recurrent aphthous ulcer and genital ulcer. He had a >10-year history of asthma and eczema. Physical examination was unremarkable except for emaciation and upper …
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