Case #400 – July 2015
A ten-year-old boy presented at a local hospital with symptoms mimicking an appendicitis. An appendectomy was performed and biopsy specimens were sent to Pathology for routine histologic work-up. Objects suggestive of a parasite were observed by the attending pathologist. Figures A–E show what was observed on a slide stained with hematoxylin-and-eosin (H&E). What is your diagnosis? Based on what criteria?
This was a case of enterobiasis caused by the pinworm, Enterobius vermicularis. Diagnostic morphologic features included:
- platymyarian musculature (MU, Figure D) with relatively few cells per quadrant.
- prominent lateral alae (arrows, Figure D).
- elongate eggs (Figure E) with a thick shell that are within the size range for E. vermicularis (normal range 50-60 μm in length).
More on: Enterobiasis
This case and images were kindly provided by the University of Miami Health System/Jackson Memorial Hospital, Miami, FL.
Images presented in the DPDx 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/.