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Case #462 - February, 2018

A 17 year-old male patient presented with cellulitis and a mass in the eye over a 3 month period. It was situated at the limbus near the lateral rectus muscle. Surgical exploration revealed a sub-conjunctival cystic mass about 1 cm in diameter. The mass was subsequently excised and sent to the pathologist for examination. The attached images were taken from hematoxylin and eosin (H&E) stained sections. What is your diagnosis? Based on what criteria?

This case and images were kindly provided by Dhruv Pathology & Molecular Diagnostic Lab, Nagpur, Maharashtra, India.

Parasitic image

Figure A

Parasitic image

Figure B

Case Answer

This was a case of cysticercosis caused by the larval form of Taenia solium. Presence of cysticerci in subcutaneous tissue is a typical presentation of cysticercosis. Diagnostic features observed were:

  • the larval cestode’s neck region with part of the scolex (Figure A)
  • calcareous corpuscles (Figure B, enlarged, green arrows).

 

Parasitic image

Figure A

 

Parasitic image

Figure B

More on cysticercosis: https://www.cdc.gov/dpdx/cysticercosis/index.html

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

  • Page last reviewed: April 15, 2018
  • Page last updated: April 15, 2018
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