Polarizable elements in scabies infestation: a clue to diagnosis
Article first published online: 30 OCT 2012
Copyright © 2012 John Wiley & Sons A/S
Journal of Cutaneous Pathology
Volume 40, Issue 1, pages 6–10, January 2013
How to Cite
Polarizable elements in scabies infestation: a clue to diagnosis., , .
- Issue published online: 21 DEC 2012
- Article first published online: 30 OCT 2012
- Accepted manuscript online: 5 OCT 2012 07:51AM EST
- Manuscript Accepted: 27 SEP 2012
- Manuscript Revised: 25 SEP 2012
- Manuscript Received: 28 JUL 2012
The diagnosis of scabies infestation is straightforward in cases where mite parts are largely visible; however, mites are often not captured in a specimen's planes of section. Polariscopic examination is a fast and simple adjunctive diagnostic tool to light microscopy. We describe the unique polariscopic findings in scabies infestation. Two cases of crusted scabies and eight cases of typical scabies were subjected to polariscopic examination. Diagnostic mite parts were visualized in at least one section in all cases. Attached and detached spines as well as scybala (fecal material) are polarizable. Specifically, spines show a polarizable outer sheath with dark central core while scybala show peripherally concentrated, stippled birefringence. Similar stippled birefringence is visible within the gut of some mites whereas significant birefringence is not appreciated in other mite parts. These results suggest that polariscopic examination is a helpful clue in the diagnosis of scabies infestation, especially in cases where the body of the mite is not visualized.