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Mucosal manifestation under gastroscopy and enteroscopy. A: Gastroscopy showed diffuse edema and local mucosal erosion, ulcers, and bleeding in the fundus of the stomach; B: Granular and friable changes were observed in the gastric antrum without causing lumen stenosis; C: The mucosa contained edema and erosions in front of the duodenal bulb; D: Continuous superficial ulcers and spontaneous bleeding were observed in the rectum by colonoscopy.
