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Related Experiment Videos

Proliferating trichilemmal cyst.

A Poiares Baptista, L Garcia E Silva, M C Born

    Journal of Cutaneous Pathology
    |June 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Proliferating trichilemmal cysts, often seen in older adults, are benign tumors. Histological analysis suggests they originate as hamartomas of the hair follicle, not from pre-existing cysts.

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    Area of Science:

    • Dermatopathology
    • Oncology

    Background:

    • Proliferating trichilemmal cysts (PTCs) are uncommon skin tumors.
    • Their exact histogenesis remains debated, with theories suggesting derivation from either ordinary trichilemmal cysts or de novo.
    • Understanding PTC origin is crucial for accurate diagnosis and management.

    Purpose of the Study:

    • To investigate the histogenesis of proliferating trichilemmal cysts.
    • To analyze the histological features of PTCs and compare them with ordinary trichilemmal cysts.
    • To determine if PTCs represent a distinct entity or an evolution of pre-existing cysts.

    Main Methods:

    • Retrospective analysis of 14 cases of proliferating trichilemmal cysts.
    • Detailed histological examination of cyst morphology, including variations within and between lesions.

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  • Comparison of histological features with ordinary trichilemmal cysts.

    • Main Results:

    • Fourteen cases (9 female, 5 male) aged 40-80 (12 over 60) were studied.
    • Cysts were present for 2-50 years, with recent enlargement in some; 7 were ulcerated.
    • Histological features supported PTCs as hamartomas of the terminal hair follicle, with differentiation towards infundibular and matricial segments, suggesting a de novo origin.

    Conclusions:

    • Proliferating trichilemmal cysts are likely hamartomas of the terminal hair follicle.
    • They originate as distinct entities rather than evolving from ordinary trichilemmal cysts.
    • PTCs exhibit differentiation towards various hair follicle segments.