HAIR COLLAR SIGN
By Gary M. White, MD
Courtesy O. Dale Collins, MD
The hair collar sign, aka hair necklace, is a congenital ring of hair on the scalp surrounding a central lesion.
- Potential central lesions include aplasia cutis congenita and heterotopic brain tissue.
- There may be skull defects, direct connections to the central nervous system, as well as brain and cerebrovascular anomalies.
- The cutaneous findings are not predictive of a specific cranial or CNS anomaly.
- MRI should be done [JAAD 2017;76;478].
A ring of hair is seen around a congenital lesion, usually of the scalp.
Careful clinical evaluation and MRI of the brain are indicated prior to biopsy or excision of these scalp lesions.
Aplasia Cutis Congenita with Hair Collar Sign. Actas Dermo-Sifiliograficas
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