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[Hair cylinders].

R Rüdlinger, A Vogel, J Meyer

    Der Hautarzt; Zeitschrift Fur Dermatologie, Venerologie, Und Verwandte Gebiete
    |February 1, 1984
    PubMed
    Summary
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    This study used electron microscopy to examine hair casts, revealing a three-layered structure. Findings suggest these casts involve the outer root sheath, differing from previous hypotheses.

    Area of Science:

    • Dermatology
    • Histology
    • Electron Microscopy

    Background:

    • Hair casts, also known as peripilar keratin casts, are a poorly understood phenomenon.
    • Previous etiological theories for hair casts are considered heterogeneous.
    • A review of 31 previously documented cases of hair casts is included.

    Observation:

    • Electron microscopy was employed to investigate the ultrastructure of hair casts from two pediatric patients.
    • The study meticulously analyzed the layered composition of the hair casts.

    Findings:

    • The ultrastructural analysis identified three distinct layers within the hair casts.
    • Two layers were consistently interpreted as originating from the internal root sheath.
    • The third layer was identified as containing components of the outer root sheath.

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    Implications:

    • The findings challenge the historical hypothesis by Kligman (1957) regarding the follicular infundibulum epithelium.
    • This research provides a refined understanding of hair cast composition at a ultrastructural level.
    • Further research into the heterogeneous etiology of hair casts is warranted.