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Monthy Case Studies - 2012

Case #334 - October, 2012

During the laboratory component of the DPDx Diagnostic Parasitology Workshop on Intestinal Parasites, a participant made an observation on a trichrome-stained fecal smear and wanted to share with the class. The images in Figures A and B were captured at 1000x oil magnification. The two images show the same object in different focal planes. What is your diagnosis? Based on what criteria?

Figure A

Figure A

Figure B

Figure B

Show Answer


Answer to Case #334

The figures showed a trophozoite of Entamoeba coli with an ingested cyst of Giardia duodenalis. Diagnostic features included:

  • an amoeba trophozoite with coarse cytoplasm and within the size range for E. coli.
  • a single nucleus with an eccentric karyosome.
  • a large vacuole that contained a cyst within the size range for G. duodenalis demonstrating intracytoplasmic fibrils, two nuclei.

More on: Giardiasis

More on: Entamoeba coli

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Images presented in the monthly case studies are from specimens submitted for diagnosis or archiving. On rare occasions, clinical histories given may be partly fictitious.

 
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  • Page last reviewed November 29, 2013
  • Page last updated November 29, 2013
  • Content source: Global Health - Division of Parasitic Diseases and Malaria
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