DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY
Bleeding intestinal ulcer. Endoscope view of a bleeding intestinal ulcer (upper left) of a 34 year-old male patient. The ulcer is situated in the first part of the small intestine, known as the duodenum. This bleeding may be controlled by using a probe, which passes an electric current through the bleeding vessel to seal it (electrocautery).
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