pili annulati

ringed hair

[MIM*180600]
a rare condition in which the hair shows alternate pigmented and bright segments, the latter due to air cavities within the cortex.
Synonym(s): pili annulati

pili annulati

Etymology: L, pilus, hair + annulus ring
a condition in which the individual hairs appear to be marked by alternating bands of white as a result of some barrier in the hair that prevents passage of light and causes the rays to be reflected back, giving the appearance of white bands.
A rare autosomal dominant [MIM 180600] developmental anomaly of the hair shaft with no known clinical significance, which is characterised by alternating bands of light and dark hair due to air cavities within the shafts