title: Papular epidermal nevus with "skyline" basal cell layer (PENS) following a Blaschko linear pattern.
abstract: Papular epidermal nevus with "skyline" basal cell layer (PENS), a variant of epidermal nevi, has recently been described as a small, round or polygonal papule, visible at birth or shortly thereafter, with characteristic histopathologic features. It has been considered a separate entity from keratinocytic nevi because no lesion observed thus far has followed any of the known archetypical mosaic patterns. Here we describe for the first time a PENS lesion following a linear distribution pattern along Blaschko's lines.
authors.affiliation: Department of Dermatology and Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico di Milano, University of Milan, Milan, Italy.
authors.forename: Elisa
authors.initials: E
authors.lastname: Faure
authors.forename: Gianluca
authors.initials: G
authors.lastname: Tadini
authors.forename: Michela
authors.initials: M
authors.lastname: Brena
authors.forename: Lucia Restano
authors.initials: LR
authors.lastname: Cassulini
mesh_terms: D000293:Adolescent; D001706:Biopsy; D004817:Epidermis / Q000473:pathology*; D006801:Humans; D008297:Male; D009506:Nevus / Q000473:pathology; D012782:Shoulder; D012878:Skin Neoplasms / Q000473:pathology*