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Monthy Case Studies - 2012

Case #318 - March, 2012

A patient with travel to Mexico presented to his local public health facility with general abdominal discomfort. A stool specimen was collected and processed using the formalin-ethyl acetate (FEA) procedure. A wet mount was prepared and examined. Digital images were captured at 1000x oil magnification and sent to DPDx for consultation. Figures A-D show the objects of interest, which measured 12-15 micrometers in length. What is your diagnosis? Based on what criteria?

Figure A

Figure A

Figure B

Figure B

Figure C

Figure C

Figure D

Figure D

Acknowledgements: This case and images were kindly provided by the Washington State Public Health Laboratory.

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Answer to Case #318

The objects in this case were artifacts (possibly algal or fungal spores) and the correct diagnosis was No Parasites Found (NPF). The artifacts somewhat resembled the eggs of trematodes. The eggs of intestinal and hepatic trematodes are larger; the smallest (Opisthorchis spp.) are usually at least 25 micrometers long.

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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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