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Papular Epidermal Nevus with “Skyline” Basal Cell Layer (PENS) Following a Blaschko Linear Pattern

Authors

  • Elisa Faure M.D.,

    1. Department of Dermatology and Fondazione IRCCS Ca' Granda—Ospedale Maggiore Policlinico di Milano, University of Milan, Milan, Italy
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  • Gianluca Tadini M.D.,

    Corresponding author
    1. Department of Dermatology and Fondazione IRCCS Ca' Granda—Ospedale Maggiore Policlinico di Milano, University of Milan, Milan, Italy
    2. Department of Pediatric Clinic 1, Fondazione IRCCS Ca' Granda—Ospedale Maggiore Policlinico di Milano, University of Milan, Milan, Italy
    • Address correspondence to Gianluca Tadini, M.D., Department of Dermatology, University of Milan, Via Pace 9, Milan, Italy, or e-mail: gtadinicmce@unimi.it.

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  • Michela Brena M.D.,

    1. Department of Dermatology and Fondazione IRCCS Ca' Granda—Ospedale Maggiore Policlinico di Milano, University of Milan, Milan, Italy
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  • Lucia Restano Cassulini M.D.

    1. Department of Dermatology and Fondazione IRCCS Ca' Granda—Ospedale Maggiore Policlinico di Milano, University of Milan, Milan, Italy
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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.

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