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Acute dyspnea after colonoscopy.

A 64 year-old male with Human immunodeficiency virus, pulmonary tuberculosis treated 20 years ago, and cirrhosis was admitted with chronic, progressive dyspnea and found to have severe iron deficiency anemia (hemoglobin 4.6 g/dL). To evaluate the anemia, a colonoscopy was performed but was non-diagnostic due to suboptimal bowel preparation. Within 2 hours the patient developed acute dyspnea and abdominal discomfort. A chest radiograph is shown in Figure 1.