Renbök phenomenon in alopecia areata.
We present a second case of alopecia areata sparing a congenital nevus of the eyebrow. This inverse counterpart of perinevoid alopecia is discussed and placed in context to the recently described Renbök phenomenon. According to the present definition of a nevus as a genetic mosaic, a genetically determined resistance to alopecia areata is suggested in our case.
Bon
A M
AM
Kantonsspital, St. Gallen, Switzerland.
Happle
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R
Itin
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PH
D000293:Adolescent; D000506:Alopecia Areata / Q000473:pathology*; D005138:Eyebrows / Q000473:pathology*; D006801:Humans; D008297:Male; D009508:Nevus, Pigmented / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*