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Fig. 7C —31-year-old man with segmental thickening of terminal ileum due to allergic angioedema. Small-bowel series in same patient performed 24 hours later confirms submucosal disease with preservation of mucosa (arrow). Stool cultures were negative for pathogens, as were laboratory tests for vasculitis. Fecal material did show many Charcot-Leyden crystals, suggesting allergic edema. Patient improved over several days.