title: Porokeratosis ptychotropica.
abstract: Porokeratosis is a skin disorder clinically characterized by annular plaques with keratotic borders resembling the Great Wall of China and histopathologically by cornoid lamellae. The disease has several clinical variants. Porokeratosis ptychotropica, which has recently become part of these variants, is quite rare and little known. The entity is characterized by verrucous plaques - which may resemble a psoriasis plaque - that affect the regions of the buttocks, most commonly the gluteal cleft, with or without extremity involvement. Itching is often present. We report a rare case of porokeratosis ptychotropica and highlight its unusual manifestation (single plaque), the first case reported in the Brazilian literature.
authors.affiliation: Universidade de Santo Amaro (UNISA) - Santo Amaro (SP), Brazil.
authors.forename: Ana Carolina Franco
authors.initials: AC
authors.lastname: Tebet
authors.affiliation: Universidade de Santo Amaro (UNISA) - Santo Amaro (SP), Brazil.
authors.forename: Tatiana Gandolfi de
authors.initials: TG
authors.lastname: Oliveira
authors.affiliation: Universidade de Santo Amaro (UNISA) - Santo Amaro (SP), Brazil.
authors.forename: Anna Rita Ferrante Mitidieri de
authors.initials: AR
authors.lastname: Oliveira
authors.affiliation: Universidade de Santo Amaro (UNISA) - Santo Amaro (SP), Brazil.
authors.forename: Fabiolla Sih
authors.initials: FS
authors.lastname: Moriya
authors.affiliation: Universidade de Santo Amaro (UNISA) - Santo Amaro (SP), Brazil.
authors.forename: Jayme de
authors.initials: J
authors.lastname: Oliveira
authors.affiliation: Universidade de Santo Amaro (UNISA) - Santo Amaro (SP), Brazil.
authors.forename: Luiz Carlos
authors.initials: LC
authors.lastname: Cucé
mesh_terms: D001706:Biopsy; D001938:Brazil; D002081:Buttocks / Q000473:pathology; D004890:Erythema / Q000473:pathology; D006801:Humans; D008297:Male; D017499:Porokeratosis / Q000473:pathology*; D011537:Pruritus; D012867:Skin / Q000473:pathology*; D055815:Young Adult