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.

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Page last reviewed: September 19, 2017