title: Throwing a light on photosensitivity in atopic dermatitis: a retrospective study.
abstract: BACKGROUND
  Photosensitivity in atopic dermatitis (AD) is a well known but ill-defined phenomenon.
  
  
  OBJECTIVE
  To determine the prevalence of photosensitivity in patients with AD, define its clinical characteristics, and analyze the photo provocation test (phototest) results.
  
  
  METHODS
  A retrospective study of patients with AD who were phototested because of suspected photosensitivity at our department during the period 1994-2004.
  
  
  RESULTS
  The total number of patients with AD seen in our department between 1994 and 2004 was 3804, of whom 145 patients (45 men and 100 women) were phototested. Photosensitivity was confirmed in 108 (74%) of these 145 patients (33 men and 75 women). The minimal erythema dose (MED) for UVB was decreased in eight of these 108 patients (7%) and the MED for UVA in five patients (5%). Two major clinical reaction patterns were observed: a polymorphic light eruption-type reaction in 51 patients (47%) and an eczematous reaction in 44 patients (41%). Seventy-two of the 108 patients (67%) had a pathologic reaction to UVA and UVB, 18 patients (17%) were only UVB sensitive, and 18 patients (17%) were only UVA sensitive. Photopatch tests were performed in 125 patients (86%). Twenty-nine patients (23%) had a positive photocontact reaction to one or more substances.
  
  
  CONCLUSIONS
  Photosensitivity is found in approximately 3% of patients with AD and the majority are female. Photosensitivity in patients with AD consists of two clinical reaction patterns distinguishable by phototesting. Patients were diagnosed with either AD and co-existing polymorphic light eruption or photosensitive AD.
authors.affiliation: Department of Dermatology and Allergology, University Medical Centre Utrecht, the Netherlands. o.tenberge@umcutrecht.nl
authors.forename: Onno
authors.initials: O
authors.lastname: ten Berge
authors.forename: Huib
authors.initials: H
authors.lastname: van Weelden
authors.forename: Carla A F M
authors.initials: CA
authors.lastname: Bruijnzeel-Koomen
authors.forename: Marjolein S
authors.initials: MS
authors.lastname: de Bruin-Weller
authors.forename: Vigfus
authors.initials: V
authors.lastname: Sigurdsson
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D015897:Comorbidity; D003876:Dermatitis, Atopic / Q000175:diagnosis / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010328:Patch Tests / Q000379:methods; D010787:Photosensitivity Disorders / Q000175:diagnosis / Q000453:epidemiology*; D015995:Prevalence; D012189:Retrospective Studies; D014466:Ultraviolet Rays; D055815:Young Adult