title: Disseminated superficial actinic porokeratosis in a patient undergoing treatment with long-term narrowband ultraviolet B for psoriasis.
abstract: Disseminated superficial actinic porokeratosis (DSAP) is a subtype of porokeratosis, thought to be clonal disorder of keratinization. Chronic exposure to ultraviolet (UV) light might be an etiological cause of DSAP, of which frequent sites are sun-exposed areas. We report a case of DSAP that occurred on the trunk of a 79-year-old man with psoriasis treated with narrowband ultraviolet B (NB-UVB) for clearing and maintenance therapies. DSAP has been reported to associate with psoralen and ultraviolet A therapy and broadband UVB, but not NB-UVB. This may be the first case of DSAP after repeated exposure to NB-UVB.
authors.affiliation: Department of Dermatology, Kinki University Faculty of Medicine, Osaka, Japan. kawara@med.kindai.ac.jp
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kawara
authors.forename: Naoki
authors.initials: N
authors.lastname: Oiso
authors.forename: Akira
authors.initials: A
authors.lastname: Kawada
mesh_terms: D000368:Aged; D006801:Humans; D008297:Male; D017499:Porokeratosis / Q000175:diagnosis / Q000209:etiology*; D011565:Psoriasis / Q000532:radiotherapy*; D013997:Time Factors; D014467:Ultraviolet Therapy / Q000009:adverse effects*