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Case #345 - April, 2013

An 83-year-old man presented to a medical institution with shortness of breath and left flank pain that developed during a trip to Mexico shortly beforehand. Magnetic resolution imaging (MRI) revealed an exophytic mass on his left kidney. Approximately 4 months later he underwent surgery and the mass was sent to Pathology for analysis. The pathology report stated foreign elements of unknown etiology observed in perinephritic fat. Gomori-Grocott methenamine silver (GMS) and periodic acid-Schiff (PAS) stains were negative for fungal organisms. Images were captured of the objects of interest and sent to DPDx for consult. Figures AC show the objects; neither magnification used nor size of the objects was given. What is your diagnosis? Based on what criteria?

Figure A

Figure A

Figure B

Figure B

Figure C

Figure C

The correct diagnosis is No Parasites Found (NPF). The objects in question are Liesegang bodies, unusual objects whose origin is not completely understood but appear to be related to an inflammatory response. Although the striations are suggestive of Taenia eggs, the variable size and shape of the objects and the lack of hooklets within helps to rule-out Taenia.

this case and images were kindly provided by the David Geffen School of Medicine at UCLA, Los Angeles, CA.

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: August 24, 2016