Blink sign

From dermoscopedia

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 Editor: Ralph P. Braun

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Description In this chapter we describe the blink sign in dermoscopy
Author(s) Ralph P. Braun · Ashfaq A. Marghoob
Responsible author Ralph Braun→ send e-mail
Status unknown
Status update June 12, 2017
Status by Ralph P. Braun


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Certain dermoscopic structures are more conspicuous with nonpolarized dermoscopy (NPD), while others are more conspicuous with polarized dermoscopy (PD)[1] .
The introduction of hybrid dermoscopes now allow the user to toggle between polarized and nonpolarized light. We found that structures that are more conspicuous with either NPD or PD appear to “blink” when the observer toggles between light modes[2].
In our experience, the presence of crystalline structures, which can easily be confirmed via the blink sign, can assist in detecting amelanotic and nodular melanoma, thereby increasing diagnostic sensitivity. The presence of multiple milia cysts, which can also easily be seen via the blink test, increases diagnostic specificity by helping to correctly identify seborrheic keratosis.



References

  1. Benvenuto-Andrade et al.: Differences between polarized light dermoscopy and immersion contact dermoscopy for the evaluation of skin lesions. Arch Dermatol 2007;143:329-38. PMID: 17372097. DOI.
  2. Braun et al.: The "blink sign" in dermoscopy. Arch Dermatol 2011;147:520. PMID: 21482914. DOI.