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Nail matrix hypergranulosis

P A Fanti1, A Tosti, N Cameli

  • 1Department of Dermatology, University of Bologna, Italy.

The American Journal of Dermatopathology
|December 1, 1994
PubMed
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Nail matrix hypergranulosis, the appearance of keratohyaline granules, differs from skin hypergranulosis. This nail condition indicates inflammatory or compressive insults, unlike normal skin changes.

Area of Science:

  • Dermatopathology
  • Nail Unit Biology

Background:

  • Nail pathology presents unique features distinct from skin pathology due to nail unit anatomy and physiology.
  • Normal nail matrix lacks a granular layer, a key difference from normal skin.

Purpose of the Study:

  • To investigate nail matrix hypergranulosis, characterized by keratohyaline granules.
  • To differentiate nail matrix hypergranulosis from skin hypergranulosis and understand its pathological significance.

Main Methods:

  • Review of 150 longitudinal nail biopsy specimens.
  • Histopathological analysis to identify keratohyaline granules and assess the keratogenous zone in various nail conditions.

Main Results:

  • Keratohyaline granules were observed in the nail matrix of conditions including lichen planus, spongiotic trachyonychia, psoriasis, and Hallopeau acrodermatitis.

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  • The presence of granules correlated with the absence of the normal keratogenous zone in inflammatory, neoplastic, and infiltrative conditions.
  • Similar features were noted in malignant melanoma, primary systemic amyloidosis, and histiocytoid hemangioma.

    • Conclusions:

    • Nail matrix hypergranulosis represents an abnormal keratinization pattern in response to inflammatory or compressive insults.
    • This finding is distinct from skin hypergranulosis, which involves hyperplasia of a normal structure.
    • Nail matrix hypergranulosis is a reactive pattern analogous to epidermal parakeratosis.