FRANCOIS L'HOPITAL, ISM / SCIENCE PHOTO LIBRARY FRANCOIS L'HOPITAL, ISM / SCIENCE PHOTO LIBRARY
Hiatus hernia. Endoscope view from inside the oesophagus of the junction between the oesophagus and the stomach, showing a hiatus hernia. A hiatus hernia occurs when part of the stomach protrudes into the thorax through the hole in the diaphragm (hiatus) that the oesophagus normally passes through. Hiatus hernias are extremely common and usually produce no symptoms. In severe cases they may cause gastrooesophageal reflux, resulting in heartburn.
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