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Related Experiment Videos

Standardized A-scan echography in optic nerve disease.

M S Gans, S F Byrne, J S Glaser

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |September 1, 1987
    PubMed
    Summary

    A-scan ultrasonography effectively differentiates optic nerve lesions by analyzing nerve diameter, compressibility, and reflectivity. This method distinguishes tumors from inflammation and identifies causes of optic atrophy and disc edema.

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    Area of Science:

    • Ophthalmology
    • Neurology
    • Medical Imaging

    Background:

    • Optic nerve lesions present diagnostic challenges.
    • Accurate differentiation is crucial for appropriate patient management.
    • Standardized A-scan ultrasonography offers a non-invasive imaging modality.

    Purpose of the Study:

    • To evaluate the utility of A-scan ultrasonography in differentiating various optic nerve lesions.
    • To correlate echographic findings with specific pathologies such as tumors, inflammation, and ischemia.
    • To assess the diagnostic value of optic nerve diameter, compressibility, and reflectivity patterns.

    Main Methods:

    • Standardized A-scan examinations were performed on 59 patients with optic nerve lesions and 73 normal controls.
    • Measurements included optic nerve width (diameter) and reflectivity (spike height).
    • Tests involved primary gaze and 30 degrees eccentric gaze to assess compressibility.

    Main Results:

    • Increased nerve diameters were compressible in inflammatory conditions (optic neuritis, traumatic neuropathy) and non-compressible in tumors (meningioma, glioma).
    • Reflectivity patterns differentiated meningioma (medium) from glioma (low).
    • Ischemic optic neuropathy and central retinal vein occlusion did not alter optic nerve diameter.

    Conclusions:

    • Echographically determined optic nerve diameter, compressibility, and reflectivity are valuable for distinguishing optic nerve pathologies.
    • This technique aids in differentiating causes of optic atrophy and disc edema, including tumors, inflammation, and ischemia.
    • A-scan ultrasonography provides a reliable method for characterizing optic nerve lesions.

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