Colon non tumor
Infectious colitis (specific microorganisms)
Schistosomiasis of colon

Author: Nat Pernick, M.D. (see Authors page)

Revised: 9 January 2017, last major update November 2013

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

PubMed Search: Schistosomiasis [title] of colon
Cite this page: Schistosomiasis of colon. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/colonschistosomiasis.html. Accessed March 30th, 2017.
Definition / General
  • Fluke that causes colitis or bowel obstruction
  • Associated with underdeveloped countries, and living near dam reservoirs (Lancet Infect Dis 2006;6:411)
  • S. haematobium:
    • Africa and Middle East
    • Usually affects bladder
    • Diagnosed with urine examination
  • S. intercalatum:
    • Central West Africa
    • Uncommon
  • S. japonicum:
    • Southeast Asia and western Pacific countries
    • Diagnose with stool examination
  • S. mansoni:
    • South America, Caribbean, Africa and Middle East
    • Diagnose with stool examination
  • S. mekongi:
    • Southeast Asia
    • Uncommon
Case Reports
Micro Description
  • Focal ulcers, eggs may be calcified, surrounded by fibrosis or surrounded by granuloma
  • S. haematobium: eggs are 110-170 x 40-70 microns, oval with terminal spine
  • S. japonicum: eggs are 70-100 x 55-65 microns, oval/round (more rounded than other types), minute subterminal or no spine
  • S. mansoni: eggs are 110-175 by 45-70 microns with thin transparent shell and definite lateral spine
Micro Images

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Within colonic mucosa - Contributed by Dr. Lisa Cerilli



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Fluke - anterior part

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Fluke - adult (female and male)

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Eggs



S. japonicum
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Fluke - anterior part

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Fluke - adult (female and male)

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Eggs

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Eggs in rectum



S. mansoni
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Fluke - male

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Eggs

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Colon-eggs speciated
from stool exam



Within tissue-species not specified
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intramucosal calcified bodies

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Calcified bodies often clustered

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Granuloma surrounding egg

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Occasional forms suggestive
of spines or hooks