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Case #433 - December, 2016

A 34-year-old male from Louisiana presented with abdominal discomfort. A stool specimen was collected in 10% formalin and a formalin-ethyl acetate (FEA) concentration was performed. A wet mount smear was prepared from the sediment and examined for ova and parasites (O & P).  Figure A was captured at 100x magnification; Figures BD were captured at 400x magnification.  The objects of interest measured 155-165μm by 48-55μm. What is your diagnosis?  Based on what criteria?

Figure A

Figure A

Figure B

Figure B

Figure C

Figure C

Figure D

Figure D

This case and images were kindly provided by ARUP Laboratories, Salt Lake City, UT

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.

DPDx is an educational resource designed for health professionals and laboratory scientists. For an overview including prevention, control, and treatment visit www.cdc.gov/parasites/.

Page last reviewed: November 4, 2020