Psoriasis on the Leg: Site-specific Histopathological and Immuno­histochemical Features and Diagnostic Difficulties

Authors

  • Mihaela Fülle
  • Dieter Metze
  • Almut Böer-Auer
  • Nani Osada
  • Stephan A. Braun Department of Dermatology, University Hospital Münster, DE-48149 Münster, Germany

DOI:

https://doi.org/10.2340/00015555-3817

Keywords:

dermatopathology, extremities, histopathology, leg, psoriasis

Abstract

The histopathology of psoriasis can lack classical features on certain anatomical sites. The aim of this study was to detail the histopathology and immunophenotype of psoriasis on the legs, in order to differentiate it from other inflammatory dermatoses, such as stasis dermatitis. The histopathology of psoriasis on the legs was retrospectively compared with psoriasis on the trunk and stasis dermatitis. Statistically, psoriasis on the legs was significantly less likely to show typical histological criteria of psoriasis, such as regular hyperplasia, suprapapillary thinning, and “kissing vessels”. The most valuable criteria to distinguish psoriasis on the legs from stasis dermatitis were the presence of neutrophils in the cornified layer and staggered parakeratosis. In addition, an immunohistochemical panel (Ki-67, Bcl-2alpha, S100A7, CD3, MPO, CK10, CK16) revealed that staining with Ki-67 and MPO could be diagnostically useful. Since the cornified layer contains important histopathological clues to differentiate psoriasis on the legs from stasis dermatitis, clinicians should refrain from unnecessary rubbing during disinfection before taking a biopsy.

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Published

2021-05-10

How to Cite

Fülle, M., Metze, D., Böer-Auer, A., Osada, N., & Braun, S. A. (2021). Psoriasis on the Leg: Site-specific Histopathological and Immuno­histochemical Features and Diagnostic Difficulties. Acta Dermato-Venereologica, 101(5), adv00453. https://doi.org/10.2340/00015555-3817