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Case #333 - October, 2012

A 68-year-old woman underwent a routine screening mammogram, which revealed calcifications in the right breast. Biopsy specimens were collected and sent to Pathology for histological work-up. Figures AD show what was observed at 20x, 100x, 200x, and 400x magnification respectively by the attending pathologist on one of the slides stained with hematoxylin and eosin (H&E). What is your diagnosis? Based on what criteria?


Figure A


Figure B


Figure C


Figure D

Case Answer

This was a case of sparganosis caused by the third-stage plerocercoid larva (sparganum) of a cestode in the genus, Spirometra. Diagnostic features include:

  • a thick tegument.
  • presence of calcareous corpuscles.
  • absence of defined protoscoleces.

More on: Sparganosis

This case and images were kindly provided by the Mayo Clinic, Rochester, MN.

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