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Case #471 – July, 2018

A 79 year-old man was diagnosed with encephalitis at a local hospital in Arizona. A Computed Tomography (CT) scan showed multiple brain lesions. A biopsy specimen from the occipital lobe was collected and sent to Pathology for routine histological workup. Images of structures shown in Figures A, B and C were observed by the pathologist on hematoxylin-and-eosin (H&E) stained sections and sent to DPDx for diagnostic assistance. The objects of interest shown in the Figures measured 10 – 25 µm in diameter. What is your diagnosis? Based on what criteria?

This case and the images were kindly contributed by the Health-Banner Desert Hospital, Mesa AZ

parasitic image

Figure A

parasitic image

Figure B

parasitic image

Figure C

Images presented in the dpdx 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/.