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Case #349 - June, 2013

A 59-year-old foreign correspondent sought medical attention from his health care provider for intermittent hematuria which had started while on an assignment in Malawi. A urine specimen was collected, concentrated by centrifugation, and examined microscopically. The objects shown in Figures A-C were observed in moderate numbers and measured 160 micrometers long on average. What is your diagnosis? Based on what criteria?

Case349_A

Figure A

Case349_B

Figure B

Case349_C

Figure C

Case Answer

The objects presented in this case were crystals, possibly of uric acid, and a diagnosis of No Parasites Found was given. Although the general shape and size of these crystals was similar to the eggs of Schistosoma haematobium, they lacked a terminal spine and miracidium.

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

  • Page last reviewed: August 24, 2016
  • Page last updated: August 24, 2016
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