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Case #448 - July, 2017

A lung biopsy was obtained on a 29-year-old-patient from Cameroon with cough, dyspnea, and hemoptysis. Figures AD show what was observed on a hematoxylin and eosin (H & E) stained section; Figure A is at 200x, Figure B 400x, and Figures C and D at 1000x magnification. What is your diagnosis? Based on what criteria?

parasitic image

Figure A

parasitic image

Figure B

parasitic image

Figure C

parasitic image

Figure D

This was a case of ascariasis based on the presence of migrating larvae. Diagnostic morphologic features shown in the images included:

  • Prominent alae.
  • Large excretory canals.
  • Coelomyarian muscle structure.
  • Intestine lined with microvilli.

 

For more information on: ascariasis

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: September 19, 2017