DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Thrombosed haemorrhoids. Close-up of the anus of a 55-year-old male patient with external haemorrhoids (centre) that have become thrombosed. Haemorrhoids are swollen veins protruding from the anus that can bleed and cause pain. Here a blood clot (thrombus) has formed in the vein, causing significant pain and swelling in the area of the anus.
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