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Histoid leprosy. An ultrastructural observation

M J Ridley, D S Ridley

    International Journal of Leprosy and Other Mycobacterial Diseases : Official Organ of the International Leprosy Association
    |June 1, 1980
    PubMed
    Summary
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    This study examined a histoid leprosy nodule using electron microscopy, revealing young macrophages with high turnover and spindle cells near the pseudocapsule associated with collagen, suggesting a hyperactive lesion.

    Area of Science:

    • Dermatology
    • Pathology
    • Microbiology

    Background:

    • Leprosy is a chronic infectious disease caused by Mycobacterium leprae.
    • Histoid leprosy is a rare form characterized by distinct nodular lesions.
    • The cellular composition and dynamics of histoid lesions are not fully understood.

    Purpose of the Study:

    • To investigate the ultrastructural characteristics of a histoid leprosy nodule.
    • To identify the cell types and their distribution within the lesion.
    • To understand the cellular turnover and matrix composition of histoid granulomas.

    Main Methods:

    • Electron microscopy was used to examine a histoid nodule from an untreated patient.
    • Cellular morphology and spatial distribution were analyzed.

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  • Association of cell types with collagen presence was noted.

    • Main Results:

    • The main granuloma mass consisted of young macrophages with a high cell turnover rate.
    • Spindle-shaped cells, associated with collagen, predominated near the pseudocapsule.
    • Plasmacytoid cells were observed among the macrophages.

    Conclusions:

    • Histoid leprosy lesions exhibit a hyperactive cellular environment, particularly with young macrophages.
    • The presence of spindle cells and collagen near the pseudocapsule may indicate specific reactive processes.
    • The precise stimulus driving the hyperactivity in histoid lesions remains unknown.