Cases from the Osler Medical Service at Johns Hopkins University

      PRESENTING FEATURES: A 91-year-old man who had chronic renal insufficiency presented with diarrhea and intermittent abdominal pain of 4 weeks’ duration. He had four stools per day, which occasionally awakened him from sleep. He denied back pain, fever, weight loss, melena, bright red blood from the rectum, and changes in urination.
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