Hydatid cyst in a horse liver

  • Michael Frank, Royal Veterinary College
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Hydatid cyst in a horse liver. Michael Frank, Royal Veterinary College. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.

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Photograph of part of the liver from a horse. The liver has been carefully dissected to show a hydatid cyst, an immature stage in the life cycle of the tapeworm Echinococcus granulosus. The adult tapeworm, just a few millimetres long, is found in the small intestine of dogs and foxes. A wide variety of both domestic and wild animals, including humans, can act as the intermediate host for this parasite and harbour the cyst stage shown here.

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