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[Localized reticulate hyperpigmentation].

M Schiller1, B Kütting, T Luger

  • 1Hautklinik der Westfälischen Wilhelms-Universität Münster.

Der Hautarzt; Zeitschrift Fur Dermatologie, Venerologie, Und Verwandte Gebiete
|August 25, 1999
PubMed
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This study details a rare reticulate pigmentary disorder in a pregnant woman, identifying key histological features. The findings suggest it

Area of Science:

  • Dermatology
  • Medical Genetics
  • Histopathology

Background:

  • Reticulate pigmentary disorders present a spectrum of clinical manifestations.
  • Accurate diagnosis is crucial for appropriate patient management and prognosis.
  • Differentiating these conditions from other pigmented lesions is clinically important.

Observation:

  • A 34-year-old pregnant woman presented with reticulate hyperpigmentation on flexural areas, hands, and the genitoperianal region.
  • Histopathology revealed pigmented filiform downgrowths and epithelial cysts.
  • Melanocyte counts were normal, but melanosomes were abundant in melanocyte dendrites and keratinocytes.

Findings:

  • The case was diagnosed as a localized reticulate pigmentary disorder.
  • Histological findings included pigmented filiform downgrowths and epithelial cysts.

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  • Immunohistochemical and ultrastructural studies showed normal melanocyte numbers with mature melanosomes.

    • Implications:

    • This case supports the concept that various reticulate pigmentary disorders may represent phenotypic variations of a single autosomal dominant genodermatosis.
    • Understanding the spectrum of reticulate hyperpigmentations is vital for clinical practice.
    • Distinguishing these from vulvar melanosis or acanthosis nigricans is essential.