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Ringed hair disease

ORPHA169
Synonym(s) Pili annulati
Prevalence Unknown
Inheritance Autosomal dominant
or Not applicable
Age of onset Childhood
ICD-10
  • Q84.1
OMIM
UMLS
  • C0263489
MeSH
  • C537187
MedDRA -

Summary

Pili annulati is an isolated, benign hair shaft abnormality, that usually presents after the age of 2, affecting usually the hair of the scalp or very rarely beard, axillary, or pubic hair and is characterized by a banded or speckled appearance due to alternating light bands (corresponding to air-filled cavities within the cortex of the affected hair shafts) and dark bands. The bands have a lifelong duration, may only be detectable under light microscopy, are more apparent in fair-colored hair or with age-related graying, and have no effect on hair growth or fragility in the vast majority of cases.


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