Monthy Case Studies - 2012
Case #316 - February, 2012
A 75-year-old man developed a lesion on his right forearm. The lesion developed approximately one month after returning from a trip to Costa Rica. The patient's attending physician removed what appeared to be a fly larva. The larva was sent to the hospital's Microbiology Department for further identification. Figure A and B show the ventral and lateral sides of the larva, respectively. Figure C shows a close-up of the mouthparts. Figure D shows a close-up of the cuticular spines. What is your identification? Based on what criteria?
Acknowledgments: This case and images were kindly provided by HealthEast St. Joseph’s Hospital, St. Paul, MN.
Answer to Case #316
This was a case of myiasis caused by Dermatobia hominis. Diagnostic criteria included:
- body shape (thicker anterior two-thirds, suddenly tapering to posterior end).
- cuticular spines not present on every body segment.
- travel to Central America.
More on: Myiasis
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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.