Atypical Congenital Triangular Alopecia (Brauer Nevus): Case Report and Review of Literature in Occipital and Mid-Frontal Localizations

摘要

Introduction: Brauer nevus, also known as congenital triangular alopecia (CTA) is a localized alopecia that rarely affects the occipital or mid-frontal region. CTA is a localized follicular hypoplasia, commonly misdiagnosed as alopecia areata. Although named congenital, onset in adulthood is possible. Case Presentation: We present a review of literature of eighteen atypical locations, providing 4 new cases to the 9 previously published, with particular attention to trichoscopy and histopathological descriptions in this exceptional presentation forms. Discussion: Occipital and mid-frontal Brauer nevus are unusual findings with very few cases reported so far. Because of its rarity and atypical presentation,it can often lead to a misdiagnosis. A higher incidence in the male sex stands clear in these locations. Detection at birth is slightly more frequent than in the classical CTA. Histo-pathological and trichoscopy findings do not differ from the classical entity, although white or hypopigmented hairs do not seem to be an item present in the mid-frontal forms.