Encyclopedia of Parasitology

Living Edition
| Editors: Heinz Mehlhorn


  • Heinz Mehlhorn
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27769-6_4549-1
This term describes the outermost layer of the hydatid cyst, which is formed by the tapeworm Echinococcus granulosus in intermediate hosts (e.g., sheep, cattle) or in humans. This pericyst consists of depressed/degenerated host cells, while the inner layers (germinal layer, laminated layer) are of parasite origin. The pericyst protects the hydatid and the therein included protoscolices, which after ingestion by the final hosts (dogs) grow up to the typical adult worm. Ye and Mehlhorn ( 2015) showed that long, tiny channels protrude from the surface of the hydatid, pass through the pericyst, and reach until the healthy tissue of the host (Figs. 1 and 2). Apparently these channels are used to import substances needed for the growth of the hydatid.


Host Cell Intermediate Host Healthy Tissue Adult Worm Hydatid Cyst 
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  1. Ye B, Mehlhorn H (2015) Discovery of microchannels in host tissues surrounding hydatid cyst. Parasitol Res 114:1245–1246Google Scholar

Further Reading

  1. Craig P, Pawlowski Z (eds) (2002) Cestodezoonoses: echinococcosis and cysticercosis: an emergent global problem, vol 341, Nato science series. Series 1: life and behavioural science. IOS Press, Amsterdam. ISBN 1566-7893Google Scholar
  2. Golzari SEJ, Sokouti M (2014) Pericyst: the outermost layer of hydatid cysts. World J Gastroenterol 20:137–1378CrossRefGoogle Scholar
  3. Latinga MA et al (2013) Evaluation of hepatic cystic lesions. World J Gastroenterol 19:3543–3554CrossRefGoogle Scholar
  4. Mehlhorn H (ed) (2015) Encyclopedia of parasitology, 4th edn. Springer, Heidelberg/New YorkGoogle Scholar
  5. Togersin PR et al (2011) Cystic echinococcosis. In: Palmer SR et al (eds) Oxford textbook of zoonoses, 2nd edn. Oxford University Press, Oxford, pp 650–899Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Institut für Zoomorphologie, Zellbiologie und ParasitologieHeinrich-Heine-UniversitätDüsseldorfGermany