Lung - nontumor
Paragonimus kellicotti

Topic Completed: 1 September 2011

Revised: 29 January 2019, last major update September 2011

Copyright: (c) 2003-2017,, Inc.

PubMed search: Paragonimus kellicotti

Elliot Weisenberg, M.D.
Page views in 2019: 304
Page views in 2020 to date: 157
Cite this page: Weisenberg E. Paragonimus. website. Accessed May 31st, 2020.
Clinical features
  • Freshwater trematode (lung fluke) found in North America that infects crayfish and crabs as intermediate hosts (MMWR Morb Mortal Wkly Rep 2010;59:1573)
  • Humans acquire infection by ingesting raw or undercooked infected shellfish; rarely contaminated seaweed or watercress
  • Larvae mature in gut and migrate through diaphragm to infect lungs
  • Most cases in Asia due to P. westermani; schistosomiasis may also involve the lung
  • May mimic lung tumor (Korean J Parasitol 2011;49:69)
  • May require serology to confirm diagnosis
Case reports
Microscopic (histologic) description
  • Necrotizing or non-necrotizing granulomas with giant cells containing eggs with operculum; also organizing pneumonia (Am J Surg Pathol 2011;35:707)
  • Variable vasculitis and pleuritis; also lymphocytes, plasma cells, eosinophils
  • Egg is birefringent
Cytology images

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