[The 462nd case: chronic watery diarrhea and acute kidney injury]

A 60-year-old man presented with severe watery diarrhea for 2 months complicated with weight loss and acute kidney injury. He did not respond well to antidiarrheal medicines, empirical antibiotics and dietary exclusion of gluten or even complete bowel rest. The final diagnosis of autoimmune enteropathy (AIE) was made based on histopathologic findings of endoscopic biopsy from duodenal mucosa after excluding neoplastic disease, inflammatory bowel disease, and infectious diarrhea, etc. Chronic diarrhea and oliguria alleviated after the administration of corticosteroids.