DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY
Oesophageal diverticulum. Endoscope view of a mid- oesophageal (or traction) diverticulum (right), a sac in the wall of the oesophagus. The true lumen of the oesophagus is at left. Diverticula such as this generally cause no symptoms and rarely have to be treated.
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