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Olivary enlargement: chronological and morphometric analyses

N Goto, M Kaneko

    Acta Neuropathologica
    |January 1, 1981
    PubMed
    Summary

    Primary pontine hemorrhage causes chronologic and morphometric changes in the human inferior olivary nucleus. Olivary enlargement progresses through six stages, including hypertrophy and pseudohypertrophy, with distinct neuronal and glial alterations observed.

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    Area of Science:

    • Neuroscience
    • Neuropathology

    Background:

    • Primary pontine hemorrhage can lead to secondary degeneration in connected brain structures.
    • The inferior olivary nucleus (ION) is susceptible to changes following brainstem lesions.

    Purpose of the Study:

    • To investigate the chronologic and morphometric alterations in the human ION following primary pontine hemorrhage.
    • To identify distinct stages of ION changes and associated cellular components.

    Main Methods:

    • Study of eight human cases with varying survival periods post-pontine hemorrhage.
    • Utilized optic electronic planimetry and computer analysis for morphometric measurements of ION area.
    • Examined neuronal and glial components, including astrocytes.

    Main Results:

    • Observed ION enlargement in cases surviving from 3 weeks to 9.5 months.
    • Identified six stages of ION changes: no change, amiculum degeneration, hypertrophy, culminant enlargement, pseudohypertrophy, and atrophy.
    • Stage 3 (hypertrophy) showed neuronal cellular hypertrophy and sclerotic neurons; stages 4 and 5 exhibited gemistocytic astrocytes in enlarged IONs.

    Conclusions:

    • Primary pontine hemorrhage induces a predictable sequence of chronologic and morphometric changes in the ION.
    • Distinct cellular changes, including neuronal hypertrophy and gemistocytic astrocytes, characterize specific stages of ION enlargement.
    • Morphometric analysis did not confirm astrocyte proliferation during ION enlargement.

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