title: Giant verrucous porokeratosis of Mibelli mimicking psoriasis in a patient with psoriasis.
abstract: Porokeratosis of Mibelli is a disorder of epidermal keratinization characterized by annular plaques with an atrophic center surrounded by a keratotic wall. We report a case of a giant verrucous porokeratosis of Mibelli mimicking psoriasis that developed in a patient with psoriasis and therefore went unrecognized for a long time. Histologically the lesion combined features of porokeratosis at the periphery and of psoriasis at its center, a picture recently described as "psoriasis encircled by porokeratosis." The possible pathogenetic relationship between psoriasis and the development of porokeratosis is also discussed.
authors.affiliation: Department of Dermatology, Università Cattolica del Sacro Cuore, Rome, Italy.
authors.forename: Clara
authors.initials: C
authors.lastname: De Simone
authors.forename: Andrea
authors.initials: A
authors.lastname: Paradisi
authors.forename: Guido
authors.initials: G
authors.lastname: Massi
authors.forename: Ilaria
authors.initials: I
authors.lastname: Proietti
authors.forename: Angela
authors.initials: A
authors.lastname: Capponi
authors.forename: Pier Luigi
authors.initials: PL
authors.lastname: Amerio
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Capizzi
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D017499:Porokeratosis / Q000175:diagnosis* / Q000473:pathology; D011565:Psoriasis / Q000175:diagnosis*