A 52-year-old man has suffered with chronic diarrhea for several years, but has refused to see a doctor. He finally comes because he is having trouble driving at night, because of difficulty seeing. Physical examination reveals a slender, pale, unwell-looking man. He has a microcytic anemia, slight elevation in the INR, low ionized calcium, and albumin levels. Which of the following is the most likely cause for his diarrhea?
Correct Answer: malabsorption
Description: His night blindness suggests vitamin A deficiency, which is more likely to occur with malabsorption. His anemia and general appearance are compatible with chronic inflammatory bowel disease as well, but the clinical and biochemical features of fat-soluble vitamin deficiency (in this case vitamin A, D, and K) suggest malabsorption.
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