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Delta Sign
Delta Sign
Source: Fox, Gary. “Diagnosis of Scabies by Dermoscopy.” BMJ Case Reports, BMJ Publishing Group, 2009, casereports.bmj.com/content/2009/bcr.06.2008.0279. Accessed 08 Oct. 2024.
Histopathological Correlation: The delta sign reflects the triangular structures representing the anterior part (head and legs) of the scabies mite. These structures are embedded within the burrow created by the mite.
Other Names/Synonyms: Hang Glider Sign, Triangle Sign.
Clinical Relevance: This sign indicates the presence of the scabies mite itself within the burrow. It is specifically useful for identifying the location of the mite during dermoscopy.
Associated Lesions: Scabies infestations, especially classical and crusted scabies.
Variants or Related Patterns: The Jetliner with Contrail Sign, where the mite body appears more translucent, and the Noodle Pattern, which shows multiple burrows, are related patterns seen in scabies.
Key Differentiators: The triangular shape and its relation to the mite head and legs help differentiate this from other burrow-like structures.
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