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Superimposed linear psoriasis: a historical case revisited.

Rudolf Happle1

  • 1Department of Dermatology, Freiburg University Medical Center, Freiburg, Germany. rudolf.happle@uniklinik-freiburg.de

Journal Der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG
|October 27, 2011
PubMed
Summary

A rare case initially diagnosed as ichthyosis vulgaris and inflammatory linear verrucous epidermal nevus syndrome is re-evaluated. Current understanding suggests superimposed linear psoriasis is a more fitting diagnosis for this patient.

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Area of Science:

  • Dermatology
  • Genetics
  • Pathology

Background:

  • A 1978 case report described a 10-year-old girl with ichthyosis vulgaris and inflammatory linear verrucous epidermal nevus (ILVEN) syndrome.
  • The initial presentation included linear lesions consistent with ILVEN.

Observation:

  • The patient also exhibited multiple psoriatic plaques.
  • These plaques displayed a symmetrical and non-segmental distribution.
  • This distribution pattern is characteristic of psoriasis.

Findings:

  • Re-evaluation suggests that superimposed linear psoriasis is a more accurate diagnosis than ILVEN syndrome.
  • The linear lesions likely result from clonal expansion of cells with a postzygotic mutation.
  • This mutation predisposes the individual to developing psoriasis.

Implications:

  • This case highlights the importance of considering psoriasis in the differential diagnosis of linear dermatoses.
  • Understanding the genetic basis of mosaic conditions like linear psoriasis can inform future diagnostic approaches.
  • Further research into clonal evolution in dermatological conditions is warranted.