GASTROLAB / SCIENCE PHOTO LIBRARY GASTROLAB / SCIENCE PHOTO LIBRARY
Endoscope view of the lower part of the oesophagus showing patches of colour change on the wall known as Barrett's oesophagus. Cells lining the oesophagus have changed into cells lining the stomach (metaplasia) because of chronic reflux disease in which stomach acid damages the oesophagus.
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