title: [Not Available].
abstract: Pityriasis rotunda disorder of keratinization clinically described as persistent, large, sharply defined circular patches of ichthyosiform scaling with no inflammatory changes. Patients with pityriasis rotunda may be classified into one of two groups, which are based on ethnicity, number of lesions, family history, and association with systemic diseases. A 45-year-old woman presented with asymptomatic, sharply-demarcated, round, scaly, hyperpigmented lesions on her leg that had been present for several years. Our patient did not have systemic disease or malignancy and so does not fit into groups already described.
authors.forename: Renata Brandao
authors.initials: RB
authors.lastname: Villa Verde
authors.forename: Lilian
authors.initials: L
authors.lastname: Viana Barbosa
authors.affiliation: Hospital Universitário Antônio Pedro Universidade Federal Fluminense, Niterói (RJ), Brasil.
authors.forename: Maria Claudia
authors.initials: MC
authors.lastname: De Almeida Issa
authors.forename: Luciana
authors.initials: L
authors.lastname: Pantaleao
authors.forename: Lara
authors.initials: L
authors.lastname: Pavlikoff Issa
authors.forename: Flavio
authors.initials: F
authors.lastname: Barbosa Luz
mesh_terms: D001707:Biopsy, Needle; D001938:Brazil; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D015603:Keratinocytes / Q000473:pathology*; D007642:Keratosis / Q000473:pathology*; D007866:Leg; D008875:Middle Aged; D010915:Pityriasis / Q000145:classification / Q000473:pathology*; D011379:Prognosis; D012307:Risk Factors; D012720:Severity of Illness Index