FRANCOIS L'HOPITAL, ISM / SCIENCE PHOTO LIBRARY FRANCOIS L'HOPITAL, ISM / SCIENCE PHOTO LIBRARY
Rectal varicose vein, endoscope view. The swollen and inflamed vein is at lower centre. The rectum is the final part of the digestive system, used to store faeces prior to removal via the anus. Varicose veins form due to defective valves in veins. As the valves stop working, blood pools downwards, distending the veins.
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