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Diagnostic approach in lymphoplasmacytic plaque.

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Lymphoplasmacytic plaque (LPP) is a rare skin disease. New criteria help diagnose LPP, which can affect adults and appear beyond the lower leg, with distinct histological patterns identified.

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Area of Science:

  • Dermatopathology
  • Histopathology
  • Immunohistochemistry

Background:

  • Lymphoplasmacytic plaque (LPP) is a rare, recently described skin disease.
  • Characterized by dermal lymphohistiocytic infiltrate with polyclonal plasma cells.
  • Typically presents as reddish-brown plaques on the lower legs of children.

Purpose of the Study:

  • To establish definitive clinical and histological criteria for LPP.
  • To develop a diagnostic flowchart for LPP.
  • To expand understanding of LPP presentation and characteristics.

Main Methods:

  • Investigated six LPP cases and reviewed ten literature cases.
  • Utilized immunohistochemistry for immunoglobulin light chains, IgG, IgG4, CD31, and CD163.
  • Conducted PCR for infectious agents (Borrelia, Mycobacterium, Leishmania).

Main Results:

  • Identified three histological patterns: superficial band-like, deep dermal, and mixed.
  • Acanthosis and interface dermatitis are key features.
  • A new feature, 'free-floating' collagen bundles surrounded by histiocytes (pseudorosettes), was identified. Infectious agents were excluded.

Conclusions:

  • LPP can be a long-standing condition affecting adults and other body regions.
  • Reproducible clinical and histological criteria enable a diagnostic work-up for LPP.
  • Distinct histological patterns and features aid in LPP diagnosis.