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a Duodenal mucosa from a 4-year-old boy with ABL. There is surface epithelial vacuolation in otherwise normallooking duodenal mucosa with preserved villus/crypt architecture (H&E; ×40). b Vacuolated appearance of surface enterocytes (H&E; ×200). c Lipid droplets in the enterocyte cytoplasm (Oil Red O; ×200)
